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U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield Co., Connecticut, USAi
Regional Level Types
U. S. Route 7 Expressway (Danbury line to Iron Works District)- not defined -
Brookfield- not defined -
Fairfield Co.County
ConnecticutState
USACountry

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Latitude & Longitude (WGS84): 41° 27' 3'' North , 73° 23' 41'' West
Latitude & Longitude (decimal): 41.45111,-73.39500
GeoHash:G#: dr7gccgqh
Köppen climate type:Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
New Fairfield14,126 (2017)7.7km
Danbury84,657 (2017)8.0km
Newtown1,967 (2017)8.7km
Bethel9,549 (2017)9.0km
Putnam Lake3,844 (2017)12.7km


The expressway section of U. S. Route 7 extending from Interstate 84 in Danbury to exit 12 at U. S. Route 202 in Brookfield was constructed between 1974 and 1976. The section from the Danbury/Brookfield line (from just north of the Agstone Co. marble quarry) to exit 12 at U. S. Route 202 (apparently the "Iron Works district" in Brookfield) traverses mostly sediments along the Still River and not much apparent bedrock. One roadcut is visible on the right of the northbound lanes, about 1 mile south of exit 12. However, Januzzi (1976) and (1994) (who is the only person known to have collected, described, and preserved specimens from here) reports a long list of minerals, many repeated in Weber and Sullivan (1995).

In Januzzi (1994) he shows photos of several minerals from the Iron Works district, apparently from exit 12, then the northern terminus of this stretch of expressway (which has since been extended further north), where bedrock evidently was encountered. Clarke (1958) shows outcrops in the area of exit 12, mapped as dolomitic marble of the Inwood (now called Stockbridge) marble, mixed with "younger granite" (now mapped as granite Proterozoic granitic gneiss). It is possible some specimens came from blasted rock brought in from elsewhere and used to grade portions of the highway.

Although the identical list of minerals in Januzzi (1976) and (1994) says all the minerals are from the U. S. Route 7 expressway construction, details accompanying photos in Januzzi (1994) indicate some came from pegmatites in the "Iron Works District", some locations "undisclosed". Because no one else has documented the specific localities and minerals, that information has largely been lost. That is unfortunate because, as Januzzi (1994) states:

The author’s research there not only confirms Shepard’s spodumene discovery in the area in 1835 (Shepard, 1837) but also establishes, in the record, a whole series of minerals that have previously not been reported including chrysoberyl, beryl, beryl var. morganite, triphylite, hydroxyfluorapatite, dickinsonite, bertrandite, as well as a number of common species.


Some small specimens attributed to Brookfield and formerly in the Januzzi collection have turned up before he passed away in 2018. With his passing more specimens are available for study and are being photographed and posted here.

The coordinates are for the approximate mid-point of this stretch of highway.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


64 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Albite
Formula: Na(AlSi3O8)
Habit: granular or tabular
Colour: white
Fluorescence: pale red under SW and MW UV
Description: Mostly a rock-forming component of pegmatite both as granular or tabular (cleavelandite) varieties.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Albite var: Andesine
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Almandine
Formula: Fe2+3Al2(SiO4)3
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Anatase
Formula: TiO2
Habit: bipyramidal
Colour: indigo-blue to pale blue
Description: "Found as indigo-blue to pale blue micro-crystals intimately associated with quartz, calcite, and feldspar. The matrix appears to be a brecciated quartz rock." Januzzi (1994). At least one very small crystal was found in Ron's collection.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396.; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Anglesite
Formula: PbSO4
Description: "Found as an isolated grayish micro-crystal associated with quartz, feldspar, and dolomite. A brown to brownish black tourmaline (dravite?) occurs in the same environment but is not common." Januzzi (1994).
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Aragonite
Formula: CaCO3
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Arsenopyrite
Formula: FeAsS
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Bertrandite
Formula: Be4(Si2O7)(OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Beryl
Formula: Be3Al2(Si6O18)
Habit: elongated prisms
Colour: pale yellow-green
Description: Subhedral crystals found in pegmatite matrix.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'Biotite'
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Calcite
Formula: CaCO3
Colour: white
Description: Mostly as a rock-forming mineral in the Stockbridge marble.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Cerussite
Formula: PbCO3
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Chalcopyrite
Formula: CuFeS2
Habit: crude tetragonal scalenohedral
Colour: golden metallic
Description: Microcrystals in Alpine cleft.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.; former Ronald Januzzi collection
'Chlorite Group'
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Chondrodite
Formula: (Mg,Fe2+)5(SiO4)2(F,OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Chrysoberyl
Formula: BeAl2O4
Habit: tabular twinned
Colour: pale yellow green to bright lemon-yellow
Description: "First collected, by the author, at a granite pegmatite in the Iron Works District of Brookfield. The first crystal was about an eighth of an inch in length and bright lemon-yellow in color; this specimen was consumed at Wesleyan University for confirmation purposes. The chrysoberyl pictured is embedded in feldspar and pale yellow green in color." Januzzi (1994). Two specimens from Januzzi's collection were obtained after he passed away and confirm the occurrence. The better crystal is only 2mm.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Chrysotile
Formula: Mg3(Si2O5)(OH)4
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Habit: subhedral elongated prism
Colour: pink
Description: The pink variety clinothulite (or possibly the zoisite analog thulite) found as small crystals in quartz matrix.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'Columbite Group'
Habit: tabular
Colour: black with iridescence
Description: Subhedral crystals in pegmatite matrix.
Reference: Former Ronald Januzzi collection
Datolite
Formula: CaB(SiO4)(OH)
Habit: tabular wedges
Colour: chalky white
Description: Microcrystals in Alpine cleft with quartz, adularia, chalcopyrite, laumontite.
Reference: Former Ronald Januzzi collection
Dickinsonite-(KMnNa)
Formula: {KNa}{Mn2+◻}{Ca}{Na3}{Mn2+13}{Al}(PO4)12(OH)2
Colour: oil-green
Description: "A new American locality for the rare phosphate dickinsonite has been discovered at an undisclosed site in Brookfield by Mr. Januzzi. The species occurs in a granite pegmatite as tiny oil-green masses associated with triphylite and vivianite." Januzzi (1994).
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Diopside
Formula: CaMgSi2O6
Colour: white-gray
Description: "In the iron works district of Brookfield (not at construction site) abundant diopside (white-gray) is found showing excellent parting planes." Januzzi (1994).
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Dolomite
Formula: CaMg(CO3)2
Habit: rhombohedral
Colour: white
Description: Mostly rock forming mineral in the Stockbridge Marble. Microcrystals found with quartz in Alpine clefts.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: anhedral
Colour: pink, green, dark green, pink/green/black concentric zones
Description: "Photo shows anhedral crystals of pink tourmaline. This discovery, by the author, is of great interest because it has helped to firmly establish the presence of a lithium phase in the pegmatitic intrusions in the Iron Works District of Brookfield." Januzzi (1994). A few macro specimens mostly frozen in matrix were found in his collection.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Habit: acicular
Colour: gray-green
Description: Reference includes photo of crystals.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Fluorapatite
Formula: Ca5(PO4)3F
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Forsterite
Formula: Mg2SiO4
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Galena
Formula: PbS
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Greenockite
Formula: CdS
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Hematite ?
Formula: Fe2O3
Description: Included in a list of minerals without details.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Hemimorphite ?
Formula: Zn4Si2O7(OH)2 · H2O
Description: Included in a list of minerals without details.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Heulandite-Ca
Formula: (Ca,Na)5(Si27Al9)O72 · 26H2O
Habit: blocky
Colour: colorless
Description: Microcrystal associated with drusy stilbite in a fracture in amphibolite.
Reference: Former Ronald Januzzi collection
'Hornblende'
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Hydrozincite ?
Formula: Zn5(CO3)2(OH)6
Description: Included in a list of minerals without details.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Ilmenite
Formula: Fe2+TiO3
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'K Feldspar' ?
Description: Included in a list of minerals without details.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Habit: wedges
Colour: cream
Description: Microcrystals in Alpine clefts.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.; Former Ronald Januzzi collection.
Kyanite
Formula: Al2(SiO4)O
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Colour: chalky white
Description: In Alpine cleft with microcrystalline datolite, quartz, adularia, chalcopyrite.
Reference: Former Ronald Januzzi collection
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: ubiquitous
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Lithiophilite
Formula: LiMn2+PO4
Habit: massive
Colour: grayish pink
Description: Massive material in pegmatite matrix.
Reference: Former Ronald Januzzi collection
Magnetite
Formula: Fe2+Fe3+2O4
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Metaswitzerite
Formula: Mn2+3(PO4)2 · 4H2O
Habit: angular flakes
Colour: golden brown
Description: Golden brown flakes and angular partial crystal aggregates to 5mm associated with vivianite on quartz, albite, microcline and spodumene matrix.
Reference: Former Ronald Januzzi collection
Microcline
Formula: K(AlSi3O8)
Habit: blocky anhedral
Colour: white
Description: Rock forming mineral in pegmatites.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Molybdenite
Formula: MoS2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Accessory in pegmatites.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Opal
Formula: SiO2 · nH2O
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Opal var: Opal-AN
Formula: SiO2 · nH2O
Habit: encrustation
Colour: brown-stained
Fluorescence: bright green under SW UV
Description: Coating on quartz from pegmatite.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Orthoclase
Formula: K(AlSi3O8)
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Palygorskite ?
Formula: (Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
Habit: fibrous
Colour: white
Description: Included in a list of minerals without details. Most likely this fibrous mineral is actually sepiolite. TEM-EDS analysis of a similar sample from the marble in Danbury proved to be sepiolite.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Pyrite
Formula: FeS2
Habit: cubic
Description: Tiny crystals <1mm associated with triphylite in pegmatite matrix in a small piece formerly in Ron Januzzi collection.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Pyromorphite
Formula: Pb5(PO4)3Cl
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Pyrrhotite
Formula: Fe7S8
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Quartz
Formula: SiO2
Habit: elongated prismatic
Colour: milky, rose, smoky, clear
Description: Mostly rock forming in pegmatite, granite gneiss and quartzite, but small to micro crystals found in Alpine clefts with dolomite or schorl.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Rutile
Formula: TiO2
Habit: equant
Colour: black
Description: Photo in reference shows crystals from "Kovac's Quarry, Iron Works District, Brookfield, Conn." Januzzi (1994).
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'Scapolite'
Colour: White to pale lilac
Description: "White to pale lilac scapolite was found, relatively recently, in numerous small masses distributed in the earth during road construction in the iron works district of Brookfield." Januzzi (1994).
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: elongated prismatic
Colour: black
Description: Massive material in pegmatites or in the core of color-zoned elbaite. Micro-crystals in Alpine clefts.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Sepiolite
Formula: Mg4(Si6O15)(OH)2 · 6H2O
Habit: fibrous
Colour: white
Description: Labelled by collector Ronald Januzzi as palygorskite but a similar-looking sample from Danbury https://www.mindat.org/photo-758041.html analyzed via TEM-EDS proved to be sepiolite.
Reference: Similar samples from identical geology found to be sepiolite via EDS analysis.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Sillimanite
Formula: Al2(SiO4)O
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1976): Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut: 227.; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Sphalerite
Formula: ZnS
Habit: tetrahedral, polysynthetically twinned
Colour: black, yellow-brown
Description: As micro-crystals in voids with clay in a brecciated marble matrix. Crystals show a variety of habits including polysynthetically twinned one similar to those from Thomaston Dam (misidentified as wurtzite).
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Spodumene
Formula: LiAlSi2O6
Habit: flat, subhedral prisms
Colour: white to pale gray
Description: "Spodumene is found in Brookfield, a few rods north of Tomlinson's tavern. It enters in small quantity, into the composition of a feldspathic granite (389) in the form of small nearly transparent, grayish or greenish white individuals, which are with difficulty distinguishable from feldspar." Shepard (1837). "My recent work in the area did turn up this specimen of spodumene found in the Iron Works District of Brookfield. It appears that granitic magma was intruded into the Inwood marble, with attendant pegmatite development, in certain areas, along the Housatonic Valley this would account for spodumene being listed in these early reports. The author has collected a number of interesting and unusual species in these pegmatites. Shepard reported his spodumene as being a few rods north of the old historic Tomlinson’s Tavern site in the Iron Works District." Januzzi (1994). Reference includes two photos. As subhedral "woody" crystals in pegmatite matrix.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.; Shepard, Charles U. (1837), A Report on the Geological Survey of Connecticut. Hamlen, New Haven.
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Stilbite-Ca
Formula: NaCa4[Al9Si27O72] · nH2O
Habit: tabular
Colour: pale yellow
Description: Microcrystals in a fracture in amphibolite.
Reference: Former Ronald Januzzi collection
Talc
Formula: Mg3Si4O10(OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Titanite
Formula: CaTi(SiO4)O
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Colour: brown to brownish black
Description: "A brown to brownish black tourmaline (dravite?) occurs with quartz, feldspar, and dolomite but is not common....This brown tourmaline could possibly be uvite: chemical analysis needed." Januzzi (1994).
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Triphylite
Formula: LiFe2+PO4
Habit: massive
Colour: grayish green
Description: "A new American locality for triphylite has been discovered at an undisclosed site in Brookfield by Mr. Januzzi. The species occurs in a granite pegmatite with tiny oil-green masses of dickinsonite associated with vivianite" Januzzi (1994). A tiny mass about 5mm with associated even tinier pyrite in pegmatite matrix preserved in a former Januzzi specimen.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Vivianite
Formula: Fe2+3(PO4)2 · 8H2O
Habit: cleaved masses
Colour: dark blue
Description: "A new American locality for vivianite has been discovered at an undisclosed site in Brookfield by Mr. Januzzi. The species occurs in a granite pegmatite with tiny oil-green masses of dickinsonite associated with triphylite". Januzzi (1994). Cleaved masses associated with metaswitzerite on quartz, albite, microcline and spodumene matrix.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Wollastonite
Formula: CaSiO3
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Zircon
Formula: Zr(SiO4)
Description: Included in a list of minerals without details, but plausible for the geology.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Zoisite
Formula: Ca2Al3[Si2O7][SiO4]O(OH)
Colour: pink
Description: A pink mass of crystals in quartz could be thulite (or the clinothulite variety of the locally much more common clinozoisite).
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 396; Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Greenockite2.CB.45CdS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Chrysoberyl4.BA.05BeAl2O4
Hematite ?4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Opal4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Dolomite5.AB.10CaMg(CO3)2
Hydrozincite ?5.BA.15Zn5(CO3)2(OH)6
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Group 8 - Phosphates, Arsenates and Vanadates
Dickinsonite-(KMnNa)8.BF.05{KNa}{Mn2+◻}{Ca}{Na3}{Mn2+13}{Al}(PO4)12(OH)2
Fluorapatite8.BN.05Ca5(PO4)3F
Lithiophilite8.AB.10LiMn2+PO4
Metaswitzerite8.CE.25Mn2+3(PO4)2 · 4H2O
Pyromorphite8.BN.05Pb5(PO4)3Cl
Triphylite8.AB.10LiFe2+PO4
Vivianite8.CE.40Fe2+3(PO4)2 · 8H2O
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
var: Andesine9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Almandine9.AD.25Fe2+3Al2(SiO4)3
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Bertrandite9.BD.05Be4(Si2O7)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Chondrodite9.AF.45(Mg,Fe2+)5(SiO4)2(F,OH)2
Chrysotile9.ED.15Mg3(Si2O5)(OH)4
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Datolite9.AJ.20CaB(SiO4)(OH)
Diopside9.DA.15CaMgSi2O6
Elbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Forsterite9.AC.05Mg2SiO4
Hemimorphite ?9.BD.10Zn4Si2O7(OH)2 · H2O
Heulandite-Ca9.GE.05(Ca,Na)5(Si27Al9)O72 · 26H2O
Kyanite9.AF.15Al2(SiO4)O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Palygorskite ?9.EE.20(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Sepiolite9.EE.25Mg4(Si6O15)(OH)2 · 6H2O
Sillimanite9.AF.05Al2(SiO4)O
Spodumene9.DA.30LiAlSi2O6
Staurolite9.AF.30Fe2+2Al9Si4O23(OH)
Stilbite-Ca9.GE.10NaCa4[Al9Si27O72] · nH2O
Talc9.EC.05Mg3Si4O10(OH)2
Titanite9.AG.15CaTi(SiO4)O
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Wollastonite9.DG.05CaSiO3
Zircon9.AD.30Zr(SiO4)
Zoisite9.BG.10Ca2Al3[Si2O7][SiO4]O(OH)
Unclassified Minerals, Rocks, etc.
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Biotite'-
'Chlorite Group'-
'Columbite Group'-
'Hornblende'-
'K Feldspar' ?-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)
'Scapolite'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Greenockite2.8.7.2CdS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite ?4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Anatase4.4.4.1TiO2
Rutile4.4.1.1TiO2
Group 7 - MULTIPLE OXIDES
AB2X4
Chrysoberyl7.2.9.1BeAl2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Hydrozincite ?16a.4.1.1Zn5(CO3)2(OH)6
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
ABXO4
Lithiophilite38.1.1.2LiMn2+PO4
Triphylite38.1.1.1LiFe2+PO4
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Metaswitzerite40.3.5.2Mn2+3(PO4)2 · 4H2O
Vivianite40.3.6.1Fe2+3(PO4)2 · 8H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)7(XO4)4Zq
Dickinsonite-(KMnNa)41.7.2.2{KNa}{Mn2+◻}{Ca}{Na3}{Mn2+13}{Al}(PO4)12(OH)2
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Pyromorphite41.8.4.1Pb5(PO4)3Cl
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Kyanite52.2.2c.1Al2(SiO4)O
Sillimanite52.2.2a.1Al2(SiO4)O
Staurolite52.2.3.1Fe2+2Al9Si4O23(OH)
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Chondrodite52.3.2b.2(Mg,Fe2+)5(SiO4)2(F,OH)2
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Bertrandite56.1.1.1Be4(Si2O7)(OH)2
Hemimorphite ?56.1.2.1Zn4Si2O7(OH)2 · H2O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Zoisite58.2.1b.1Ca2Al3[Si2O7][SiO4]O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Elbaite61.3.1.8Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside65.1.3a.1CaMgSi2O6
Spodumene65.1.4.1LiAlSi2O6
Single-Width Unbranched Chains, W=1 with chains P=3
Wollastonite65.2.1.1cCaSiO3
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Chrysotile71.1.5.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Palygorskite ?74.3.1a.1(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
Sepiolite74.3.1b.1Mg4(Si6O15)(OH)2 · 6H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Heulandite-Ca77.1.4.1(Ca,Na)5(Si27Al9)O72 · 26H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Stilbite-Ca77.1.4.3NaCa4[Al9Si27O72] · nH2O
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite
var: Andesine
-(Na,Ca)[Al(Si,Al)Si2O8]
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Aragonite-CaCO3
'Biotite'-
'Chlorite Group'-
'Columbite Group'-
'Hornblende'-
'K Feldspar' ?-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
Opal
var: Opal-AN
-SiO2 · nH2O
'Scapolite'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H BertranditeBe4(Si2O7)(OH)2
H StauroliteFe22+Al9Si4O23(OH)
H ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Limonite(Fe,O,OH,H2O)
H PhlogopiteKMg3(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H ChrysotileMg3(Si2O5)(OH)4
H TalcMg3Si4O10(OH)2
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H VivianiteFe32+(PO4)2 · 8H2O
H Opal (var: Opal-AN)SiO2 · nH2O
H MetaswitzeriteMn32+(PO4)2 · 4H2O
H OpalSiO2 · nH2O
H SepioliteMg4(Si6O15)(OH)2 · 6H2O
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
H DatoliteCaB(SiO4)(OH)
H LaumontiteCaAl2Si4O12 · 4H2O
H Stilbite-CaNaCa4[Al9Si27O72] · nH2O
H Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H HemimorphiteZn4Si2O7(OH)2 · H2O
H HydrozinciteZn5(CO3)2(OH)6
H Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Li SpodumeneLiAlSi2O6
Li TriphyliteLiFe2+PO4
Li LithiophiliteLiMn2+PO4
BeBeryllium
Be BertranditeBe4(Si2O7)(OH)2
Be BerylBe3Al2(Si6O18)
Be ChrysoberylBeAl2O4
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B DatoliteCaB(SiO4)(OH)
CCarbon
C AragoniteCaCO3
C CerussitePbCO3
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C HydrozinciteZn5(CO3)2(OH)6
OOxygen
O SillimaniteAl2(SiO4)O
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O AnataseTiO2
O BertranditeBe4(Si2O7)(OH)2
O MagnetiteFe2+Fe23+O4
O StauroliteFe22+Al9Si4O23(OH)
O ZirconZr(SiO4)
O ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O AlmandineFe32+Al2(SiO4)3
O Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
O AnglesitePbSO4
O AragoniteCaCO3
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O CerussitePbCO3
O Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
O DiopsideCaMgSi2O6
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O FluorapatiteCa5(PO4)3F
O ForsteriteMg2SiO4
O IlmeniteFe2+TiO3
O KyaniteAl2(SiO4)O
O Limonite(Fe,O,OH,H2O)
O OrthoclaseK(AlSi3O8)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O PyromorphitePb5(PO4)3Cl
O RutileTiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O ChrysotileMg3(Si2O5)(OH)4
O TalcMg3Si4O10(OH)2
O TitaniteCaTi(SiO4)O
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O VivianiteFe32+(PO4)2 · 8H2O
O WollastoniteCaSiO3
O Opal (var: Opal-AN)SiO2 · nH2O
O MetaswitzeriteMn32+(PO4)2 · 4H2O
O OpalSiO2 · nH2O
O SepioliteMg4(Si6O15)(OH)2 · 6H2O
O BerylBe3Al2(Si6O18)
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O SpodumeneLiAlSi2O6
O K Feldspar (var: Adularia)KAlSi3O8
O ChrysoberylBeAl2O4
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
O TriphyliteLiFe2+PO4
O LithiophiliteLiMn2+PO4
O DatoliteCaB(SiO4)(OH)
O LaumontiteCaAl2Si4O12 · 4H2O
O Stilbite-CaNaCa4[Al9Si27O72] · nH2O
O Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
O AlbiteNa(AlSi3O8)
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O HematiteFe2O3
O HemimorphiteZn4Si2O7(OH)2 · H2O
O HydrozinciteZn5(CO3)2(OH)6
O Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
FFluorine
F Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
F FluorapatiteCa5(PO4)3F
NaSodium
Na Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Na Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
Na Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Na Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
Mg DiopsideCaMgSi2O6
Mg ForsteriteMg2SiO4
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg ChrysotileMg3(Si2O5)(OH)4
Mg TalcMg3Si4O10(OH)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Mg SepioliteMg4(Si6O15)(OH)2 · 6H2O
Mg DolomiteCaMg(CO3)2
Mg Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
AlAluminium
Al SillimaniteAl2(SiO4)O
Al StauroliteFe22+Al9Si4O23(OH)
Al ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
Al AlmandineFe32+Al2(SiO4)3
Al Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al KyaniteAl2(SiO4)O
Al OrthoclaseK(AlSi3O8)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al BerylBe3Al2(Si6O18)
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpodumeneLiAlSi2O6
Al K Feldspar (var: Adularia)KAlSi3O8
Al ChrysoberylBeAl2O4
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
Al LaumontiteCaAl2Si4O12 · 4H2O
Al Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Al Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Al AlbiteNa(AlSi3O8)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
SiSilicon
Si SillimaniteAl2(SiO4)O
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si BertranditeBe4(Si2O7)(OH)2
Si StauroliteFe22+Al9Si4O23(OH)
Si ZirconZr(SiO4)
Si ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si AlmandineFe32+Al2(SiO4)3
Si Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
Si DiopsideCaMgSi2O6
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si ForsteriteMg2SiO4
Si KyaniteAl2(SiO4)O
Si OrthoclaseK(AlSi3O8)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si ChrysotileMg3(Si2O5)(OH)4
Si TalcMg3Si4O10(OH)2
Si TitaniteCaTi(SiO4)O
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si WollastoniteCaSiO3
Si Opal (var: Opal-AN)SiO2 · nH2O
Si OpalSiO2 · nH2O
Si SepioliteMg4(Si6O15)(OH)2 · 6H2O
Si BerylBe3Al2(Si6O18)
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si SpodumeneLiAlSi2O6
Si K Feldspar (var: Adularia)KAlSi3O8
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si DatoliteCaB(SiO4)(OH)
Si LaumontiteCaAl2Si4O12 · 4H2O
Si Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Si Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Si AlbiteNa(AlSi3O8)
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si HemimorphiteZn4Si2O7(OH)2 · H2O
Si Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
PPhosphorus
P FluorapatiteCa5(PO4)3F
P PyromorphitePb5(PO4)3Cl
P VivianiteFe32+(PO4)2 · 8H2O
P MetaswitzeriteMn32+(PO4)2 · 4H2O
P Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
P TriphyliteLiFe2+PO4
P LithiophiliteLiMn2+PO4
SSulfur
S SphaleriteZnS
S GreenockiteCdS
S AnglesitePbSO4
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S GalenaPbS
S MolybdeniteMoS2
S PyrrhotiteFe7S8
S PyriteFeS2
ClChlorine
Cl PyromorphitePb5(PO4)3Cl
KPotassium
K OrthoclaseK(AlSi3O8)
K PhlogopiteKMg3(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K K Feldspar (var: Adularia)KAlSi3O8
K Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Ca AragoniteCaCO3
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca DiopsideCaMgSi2O6
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca FluorapatiteCa5(PO4)3F
Ca TitaniteCaTi(SiO4)O
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Ca WollastoniteCaSiO3
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
Ca DatoliteCaB(SiO4)(OH)
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Ca Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
TiTitanium
Ti AnataseTiO2
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mn MetaswitzeriteMn32+(PO4)2 · 4H2O
Mn Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
Mn LithiophiliteLiMn2+PO4
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe StauroliteFe22+Al9Si4O23(OH)
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe AlmandineFe32+Al2(SiO4)3
Fe ArsenopyriteFeAsS
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe IlmeniteFe2+TiO3
Fe Limonite(Fe,O,OH,H2O)
Fe PyrrhotiteFe7S8
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe VivianiteFe32+(PO4)2 · 8H2O
Fe PyriteFeS2
Fe TriphyliteLiFe2+PO4
Fe HematiteFe2O3
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
Zn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Zn HemimorphiteZn4Si2O7(OH)2 · H2O
Zn HydrozinciteZn5(CO3)2(OH)6
AsArsenic
As ArsenopyriteFeAsS
ZrZirconium
Zr ZirconZr(SiO4)
MoMolybdenum
Mo MolybdeniteMoS2
CdCadmium
Cd GreenockiteCdS
PbLead
Pb AnglesitePbSO4
Pb CerussitePbCO3
Pb GalenaPbS
Pb PyromorphitePb5(PO4)3Cl

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Ordovician - Neoproterozoic
443.8 - 1000 Ma



ID: 3190671
Precambrian-Phanerozoic sedimentary rocks

Age: Neoproterozoic to Ordovician (443.8 - 1000 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Middle Ordovician
458.4 - 470 Ma



ID: 2789977
Basal marble member [of Walloomsac Schist]

Age: Middle Ordovician (458.4 - 470 Ma)

Stratigraphic Name: Walloomsac Schist

Description: Dark-gray to white, massive to layered schistose or phyllitic calcite-phlogopite marble.

Comments: Part of Western Uplands; Proto-North American (Continental) Terrane - Carbonate Shelf Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

Lithology: Major:{marble}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Shepard, Charles U. (1837), A Report on the Geological Survey of Connecticut. Hamlen, New Haven.
Clarke, James W. (1958): The Bedrock Geology of the Danbury Quadrangle. State Geological and Natural History Survey of Connecticut Quadrangle Report No. 7.
Schooner, Richard. (1961), The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Januzzi, Ronald E. (1976): Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut: 185.
Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 397.


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