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O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Southbury, New Haven Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 30' 50'' North , 73° 12' 57'' West
Latitude & Longitude (decimal): 41.51389,-73.21611
GeoHash:G#: dr7ujvmeu
Locality type:Quarry
Köppen climate type:Dfb : Warm-summer humid continental climate


Note, the entrance road to this quarry is on State Route 67 in Southbury; however, the quarry starts about 0.5 mile north of the entrance road and the vast majority of it is mostly in Woodbury. Because O & G operates another quarry farther north in Woodbury (O & G No. 1 or the "Woodbury" Quarry), this locality has almost universally been referred to as the "Southbury" Quarry to differentiate it, even though it too is technically in Woodbury. It has been referred to as the Silliman Quarry, but that name initially referred to an earlier sand pit a little to the south. However, Brunet (1977) states that the Silliman family, descended from Yale mineralogist Benjamin Silliman, owned the trap rock quarry, too, at that time.

Collecting field trips were kindly allowed until about 2000 when someone violated the rules, closing the site for all but a few with special permission.

Well known Connecticut locality for prehnite. Three varieties are found - the standard green, rare yellow prehnite, and the extremely rare white prehnite that is almost completely free of iron impurities. Particularly noteworthy are prehnite floater specimens called "hearts". According to Garabedian (1998) these formed via a 5-step process:

1. Chalcedony precipitation on vesicle walls as "fortification" agate.
2. Chalcedony (or partial white, fine-grained, chalky quartz replacement of initial chalcedony) is replaced by fine-grained, white, granular datolite.
3. Prehnite encrusts and/or partly replaces the datolite replacement.
4. Datolite dissolves, leaving a floater of prehnite with large crystals on the inside (small ones may be present on the outside where the datolite was partly replaced by initial prehnite).
5. More prehnite forms on the outside of the prehnite floater, resulting in aggregates with large prehnite crystals on both sides.

Examples of all the intermediate steps can be found in the vesicles.

Other noteworthy pseudomorphing described by Garabedian (1998) include:

- Pumpellyite replacement of chalcedony.
- Tabular anhydrite crystals epimorphed by chalcedony, quartz, a trapezohedral zeolite, or pumpellyite; the anhydrite later dissolves.
- Prehnite or pumpellyite encrust a trapezohedral zeolite (wairakite or analcime), which later dissolves, and more prehnite or pumpellyite partly or completely fill in the void.
- Sequential "water level" vesicle fillings by thin layers of ferroan calcite that are later epimorphed by quartz, chalcedony, datolite or pumpellyite.

Late forming minerals include pyrite, gemmy green sphalerite crystals to about 6mm, calcite as dogteeth or various rhombohedra, apophyllite, babingtonite, julgoldite/pumpellyite, drusy quartz (some amethystine) and zeolites.

Faulting created brecciated zones and cross-cutting veins filled with coarse-grained, columnar, parallel-growth calcite the grew from opposite walls and commonly stained with red, earthy hematite. These veins can reach around 1 meter thick.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


23 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Habit: trapezohedral
Colour: colorless to white
Description: The vast majority replaced by other minerals such as prehnite, pumpellyite or datolite. Surviving crystals usually small, less than 5mm.
Reference: R Wilken collection 1999
Anhydrite
Formula: CaSO4
Habit: tabular
Description: Crystallized early in the paragenesis then later dissolved, leaving casts in later epimorphic minerals, such as chalcedony, quartz, datolite, prehnite, pumpellyite. Sprays of isolated tabular crystals pseudomorphed by quartz can reach 10 cm.
Reference: Harold Moritz collection
'Apophyllite'
Habit: combinations of elongated prisms and bipyramids
Colour: colorless to white
Description: 2018 SEM-EDS analysis of three samples has determined the "-(K)" nature of these crystals, but not whether they are "fluor" or "hydroxy" dominant.
Reference: Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Arsenopyrite
Formula: FeAsS
Description: Euhedral crystals up to 2mm.
Reference: Identified by Jeremy Zolan
Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Habit: prismatic
Colour: black
Description: A rare, late-forming mineral at this locality.
Reference: Bill Barrett collection
Calcite
Formula: CaCO3
Habit: scalenohedral, rhombohedral to pseudo-cubic
Colour: colorless, white, pale yellow
Fluorescence: orange-red to pink
Description: Very common in a variety of forms, crystals can reach several cm. Late forming ones perched on prehnite are most prized. Also as thick (to 1 meter or so) fault filling by bands of opaque parallel crystals with phantoms and coatings of hematite.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.; P. Cristofono collection.
Celadonite
Formula: K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Habit: thin earthy coatings
Colour: olive to bluish-green
Description: Coating basalt associated with vesicles.
Reference: John Pawloski collection
Chabazite-Ca
Formula: (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Habit: rhombhedral
Reference: Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
'Chlorite Group'
Description: Visually identified micaceous Chlorite at a Ct museum
Reference: Visually Identified at a Ct Museum..
Datolite
Formula: CaB(SiO4)(OH)
Habit: massive, granular, to small glassy crystals
Colour: white to pale apple green
Description: Present mostly as white, granular replacement of earlier chalcedony, grading to 2 mm tabular crystals or druses. Much of it replaced by prehnite.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Ferrosaponite ?
Formula: Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Habit: micaceous or foliated globules or coatings
Colour: very dark green to black
Description: A late forming, fine-grained, very dark green to black micaceous mineral forming tiny globules or coating other minerals in vesicles in basalt. An SEM-EDS analysis conducted in 2017 concluded the mineral is an Fe-Mg-Ca aluminosilicate. The complete absence of K rules out stilpnomelane, biotite, celadonite. The Ca is too low for pumpellyite or julgoldite. A mindat.org mineral search by chemistry found ferrosaponite as a good match, as are its physical properties and geoenvironment of formation. However, XRD is needed for confirmation.
Reference: Former Bill Barrett collection
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Habit: bipyramidal
Colour: colorless to white
Description: Crystals can reach 2-3 cm, though commonly 1 cm or less. The tips of the pyramids are typically physically degraded and milky, leading to the term "snow-cone" habit for these crystals. 2018 SEM-EDS analyses or three samples has confirmed the "-(K)" nature of these crystals, but not whether they are "fluor" or "hydroxy".
Reference: Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Galena
Formula: PbS
Habit: octahedral, cubic
Colour: gray
Description: tiny, late-forming crystals perched on prehnite
Reference: Reported by Jack Pawloski of the Connecticut Mining Museum (Kent, CT) as small octahedral crystals; Harold Moritz collection
Goethite
Formula: α-Fe3+O(OH)
Habit: botryoidal to radiating
Colour: dark brown
Description: Usually as microscopic botryoidal aggregates or coatings on other crystals, such as babingtonite.
Reference: Harold Moritz collection
Gypsum
Formula: CaSO4 · 2H2O
Reference: Jack Pawlowski specimen
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Reference: Jack Pawlowski specimen
Hematite
Formula: Fe2O3
Habit: isolated plates or tufts, coatings
Colour: specular to red
Description: As microscopic crystals to a few mm. More abundant as red coatings on and within thick layers of parallel calcite crystals in large faults.
Reference: Harold Moritz collection
'Heulandite subgroup'
Habit: coffin-shaped prisms
Colour: white to almond
Description: Late forming crystals to 2 cm perched on quartz or prehnite with other zeolites and apophyllite.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Julgoldite-(Fe2+)
Formula: Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
Habit: micro radiating acicular aggregates or botryoidal
Colour: dark green to black
Description: Associated with prehnite, calcite, quartz, pumpelleyite-(Fe3+) and sometimes with babingtonite.
Reference: Vajdak, Josef. (1998): New Mineral Finds in the Second Half of 1997, News from Josef Vajdak of Pequa Rare Minerals and Metals. Mineral News: 14(1): 4.; Martins da Pedra specimen
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Habit: prismatic
Colour: white
Description: Common in many vesicles, some are filled with late forming crystals to 2-3 cm, which eventually crumble, sadly.
Reference: J. Zolan; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Habit: acicular
Colour: colorless to white
Description: Rare, acicular aggregates or isolated crystals.
Reference: P Cristofono collection; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Pectolite
Formula: NaCa2Si3O8(OH)
Habit: radiating fibrous bundles
Colour: white
Reference: Former Bob Albanese collection
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Habit: botryoidal to spherical aggregates of tabular crystals
Colour: white, pale yellow to green to blue-green
Description: Mostly lining gas vesicles, but the best specimens are floaters known as "hearts" that formed as replacements over now dissolved datolite. These can reach over 15 cm.
Reference: [www.johnbetts-fineminerals.com]; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Pumpellyite-(Mg)
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Habit: fibrous micro-crystals
Colour: dark olive green
Description: Based on the chemical formula given in Garabedian (1998), the species is pumpellyite-(Mg). One of the first minerals to crystallize in vesicles, so is typically present between later minerals and the basalt matrix, a second stage crystallization came after early calcite, anhydrite, chalcedony, a trapezohedral zeolite, and datolite and so may coat or replace these minerals. May by itself fill entire vesicles.
Reference: Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis; www.johnbetts-fineminerals.com/jhbnyc/mineralmuseum
Pyrite
Formula: FeS2
Description: Grains embedded in the basalt matrix, also as micro-crystals on prehnite.
Reference: Alfredo Petrov specimen; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Quartz
Formula: SiO2
Habit: druses lining geodes, prismatic, fine-granular, massive
Colour: coloress to white
Description: Many forms such as crystal geode linings, white chalky looking replacements of chalcedony, drusy crystals encrusting "water level" calcite wafers, epimorphs and pseudomorphs after anhydrite, isolated crystals to 3 cm.
Reference: Bill Barrett Coll.; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Quartz var: Amethyst
Formula: SiO2
Habit: drusy to coarse-grained vesicle linings
Colour: purple, usually concentrated in the terminations
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.
Quartz var: Chalcedony
Formula: SiO2
Habit: banded fortification agate
Colour: blue, white to gray
Description: Formed early in the paragenesis, typically lining vesicle walls as blue to gray fortification agate, encrusted by fine-grained, white chalky-looking quartz or quartz crystal druses. Commonly pseudomorphed by quartz, datolite, pumpellyite. May encrust "water level" calcite wafers.
Reference: Harold Moritz collection
Sphalerite
Formula: ZnS
Habit: complex tetrahedra
Colour: pale brown to olive green
Description: Typically isolated micro-crystals to 6 mm perched on prehnite, complex forms, transparent and lustrous.
Reference: J. Zolan; Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
'Stilbite subgroup'
Habit: tabular, wheat-sheaf and bow tie aggregates
Colour: white, tan, yellow-orange
Description: Late-forming crystals on prehnite or quartz to 2 cm, with other zeolites and apophyllite.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Babingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
Celadonite9.EC.15K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chabazite-Ca9.GD.10(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Datolite9.AJ.20CaB(SiO4)(OH)
Ferrosaponite ?9.EC.45Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Julgoldite-(Fe2+)9.BG.20Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Pectolite9.DG.05NaCa2Si3O8(OH)
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Pumpellyite-(Mg)9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Unclassified Minerals, Rocks, etc.
Apophyllite-
Chlorite Group-
Heulandite subgroup-
Stilbite subgroup-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
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)
Julgoldite-(Fe2+)58.2.2.1Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
Pumpellyite-(Mg)58.2.2.7Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(OH)
Single-Width Unbranched Chains, W=1 with chains P=5
Babingtonite65.4.1.2Ca2(Fe,Mn)FeSi5O14(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Celadonite71.2.2a.6K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Chabazite-Ca77.1.2.1(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chlorite Group'-
Ferrosaponite ?-Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Gypsum
var: Selenite
-CaSO4 · 2H2O
'Heulandite subgroup'-
Quartz
var: Amethyst
-SiO2
var: Chalcedony-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H AnalcimeNa(AlSi2O6) · H2O
H BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
H CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
H Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
H DatoliteCaB(SiO4)(OH)
H FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
H Goethiteα-Fe3+O(OH)
H GypsumCaSO4 · 2H2O
H Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H PectoliteNaCa2Si3O8(OH)
H PrehniteCa2Al2Si3O10(OH)2
H Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
H Gypsum (var: Selenite)CaSO4 · 2H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
OOxygen
O Quartz (var: Amethyst)SiO2
O AnalcimeNa(AlSi2O6) · H2O
O AnhydriteCaSO4
O BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
O CalciteCaCO3
O CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
O Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
O Quartz (var: Chalcedony)SiO2
O DatoliteCaB(SiO4)(OH)
O FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O Goethiteα-Fe3+O(OH)
O GypsumCaSO4 · 2H2O
O HematiteFe2O3
O Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
O LaumontiteCaAl2Si4O12 · 4H2O
O NatroliteNa2Al2Si3O10 · 2H2O
O PectoliteNaCa2Si3O8(OH)
O PrehniteCa2Al2Si3O10(OH)2
O Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
O QuartzSiO2
O Gypsum (var: Selenite)CaSO4 · 2H2O
FFluorine
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na NatroliteNa2Al2Si3O10 · 2H2O
Na PectoliteNaCa2Si3O8(OH)
MgMagnesium
Mg CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Mg FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Mg Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
AlAluminium
Al AnalcimeNa(AlSi2O6) · H2O
Al Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Al FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Al LaumontiteCaAl2Si4O12 · 4H2O
Al NatroliteNa2Al2Si3O10 · 2H2O
Al PrehniteCa2Al2Si3O10(OH)2
Al Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
SiSilicon
Si Quartz (var: Amethyst)SiO2
Si AnalcimeNa(AlSi2O6) · H2O
Si BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Si CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Si Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Si Quartz (var: Chalcedony)SiO2
Si DatoliteCaB(SiO4)(OH)
Si FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
Si LaumontiteCaAl2Si4O12 · 4H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si PectoliteNaCa2Si3O8(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Si QuartzSiO2
SSulfur
S AnhydriteCaSO4
S ArsenopyriteFeAsS
S GalenaPbS
S GypsumCaSO4 · 2H2O
S PyriteFeS2
S Gypsum (var: Selenite)CaSO4 · 2H2O
S SphaleriteZnS
KPotassium
K CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
CaCalcium
Ca AnhydriteCaSO4
Ca BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Ca CalciteCaCO3
Ca Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Ca DatoliteCaB(SiO4)(OH)
Ca FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca GypsumCaSO4 · 2H2O
Ca Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca PectoliteNaCa2Si3O8(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
MnManganese
Mn BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Fe ArsenopyriteFeAsS
Fe BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Fe CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Fe FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
Fe PyriteFeS2
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
PbLead
Pb GalenaPbS

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

Early Jurassic
174.1 - 201.3 Ma



ID: 2767078
Holyoke Basalt

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Holyoke Basalt

Description: Greenish-gray to black (weathers bright orange to brown), fine- to coarse-grained, grading from basalt near contacts to gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass.

Comments: Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins. Part of Newark Supergroup (Upper Triassic and Lower Jurassic). Part of Meriden Formation of Krynine (1950) (Lower Jurassic); CT005. 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:{basalt,gabbro}

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]

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]

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)
Silliman, Benjamin. (1819), New localities of agate, chalcedony, chabazite, stilbite, analcime, prehnite, etc. American Journal of Science: 1: 134-135.
Brunet, William. (1977), Mineral Collecting in Woodbury-Southbury, Connecticut. Rocks and Minerals: 52(4): 182-183.
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.
Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Vajdak, Josef. (1998): New Mineral Finds in the Second Half of 1997, News from Josef Vajdak of Pequa Rare Minerals and Metals. Mineral News: 14(1): 4.
Moore, Thomas. (2007): What's New in Minerals. Mineralogical Record: 38(3): 214.

External Links

www.johnbetts-fineminerals.com/jhbnyc/mineralmuseum


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