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State Route 25 road cuts, Trumbull, Fairfield County, Connecticut, USAi
Regional Level Types
State Route 25 road cutsGroup of Road Cuttings
Trumbull- not defined -
Fairfield CountyCounty
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 15' 33'' North , 73° 12' 26'' West
Latitude & Longitude (decimal):
Locality type:
Group of Road Cuttings
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Trumbull36,018 (2017)1.9km
Easton7,625 (2017)7.5km
Bridgeport147,629 (2017)10.3km
Stratford51,384 (2017)10.4km
Shelton41,296 (2017)11.5km


In the late 1970s, during the construction of the state Route 25 expressway, a low-temperature hydrothermal vein was found cross-cutting The Straits Schist about 0.75-mile north of the Daniels Farm Road overpass (Interchange 9). This sub-vertical vein was less than a meter wide and featured quartz, sphalerite, fluorite, galena, pyrite, adularia, and greenockite as primary minerals, with secondary lead minerals (cerussite, pyromorphite, wulfenite) and possibly the native silver and acanthite formed from the weathering of the galena. The vein, which has similarities to those found at the Thomaston Dam railroad cut farther north, has long been exhausted and covered. The approximate coordinates are given below.

The titanium dioxide polymorphs were found elsewhere in schist along the extensive roadcuts.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


23 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Description: in "trace amounts" pseudomorphed after argentite
Reference: Henderson, William A. (1995. Microminerals of Connecticut (Rocks & Minerals 70:420-421).; Rocks & Minerals (1995) 70:396-409
Anatase
Formula: TiO2
Description: micros in schist
Reference: Rocks & Minerals (1995) 70:397
Bertrandite
Formula: Be4(Si2O7)(OH)2
Reference: Kevin Czaja Collection, Ex: Marcelle Weber Coll: m788. 4-7-79
Bismuth
Formula: Bi
Habit: massive, striated
Colour: tarnished bronze
Description: Small mass, <2 cm, in massive quartz.
Reference: Former Ronald Januzzi collection
Brookite
Formula: TiO2
Description: micros in schist
Reference: Rocks & Minerals (1995) 70:397
Calcite
Formula: CaCO3
Reference: Mickey Marks collection
Cerussite
Formula: PbCO3
Habit: needle-like prisms
Colour: white
Description: Occurs as snow-white encrustations of intergrown needle-like crystals, formed from the weathering of galena
Reference: Rocks & Minerals (1995) 70:397; Januzzi (1994)
Dolomite
Formula: CaMg(CO3)2
Habit: curved, circular rhombohedra
Colour: white
Description: Aggregates of microcrystals late-forming on sphalerite and quartz on a specimen in the former Ronald Januzzi collection.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 397.; former Ronald Januzzi collection.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Description: reference provides no details, probably in the host schist
Reference: Rocks & Minerals (1995) 70:396-409
Fluorite
Formula: CaF2
Habit: cubic
Colour: white, yellow, green, purple
Fluorescence: blue
Description: crystals mostly < 1 cm, typically massive and generally light colored to white, associated with adularia, sphalerite, galena, quartz
Reference: Rocks & Minerals (1995) 70:397; Januzzi (1994)
Galena
Formula: PbS
Habit: cubic
Colour: gray
Description: in rough cubes up to a few cm, or massive, associated with sphalerite, quartz, fluorite and secondary lead minerals, which formed in cubic cavities left by weathered galena.
Reference: Henderson, William A. (1995. Microminerals of Connecticut (Rocks & Minerals 70:420-421).; Rocks & Minerals (1995) 70:396-409
Goethite
Formula: α-Fe3+O(OH)
Habit: massive, encrustations
Colour: dark brown to black, iridescent
Description: Iridescent encrustations on quartz in and around cavities left by weathered galena, associated with orange-brown limonite and pyromorphite.
Reference: Harold Moritz collection
Greenockite ?
Formula: CdS
Habit: crusts and films on schist, free standing micro crystals on quartz and sphalerite
Colour: yellow
Description: yellow encrustations in the veins with galena, quartz, sphalerite, fluorite commonly labeled greenockite are not confirmed. SEM-EDS on one came back as “Probably a mixture of Fe, Mn, and Zn oxides/hydroxides and/or carbonates. Maybe goethite, hydrozincite, and a Mn mineral(s)? Definitely not greenockite or and any other sulfide. We checked another spot and got similar results, except no Mn.” Perhaps impure smithsonite.
Reference: Hiller, John. (1980), Greenockite in Connecticut. The Thumbnail News: August-September: 2.
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Habit: massive, earthy
Colour: orange-yellow
Description: earthy crusts on fractures in massive smoky quartz
Reference: Ted Johnson collection
'K Feldspar'
Habit: well-terminated prismatic micros
Colour: white
Description: micro crystals associated with quartz, sphalerite, fluorite, galena.
Reference: Rocks & Minerals (1995) 70:397; Ronald Januzzi collection.
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Habit: well-terminated prismatic micros
Colour: white
Description: micro crystals associated with quartz, sphalerite, fluorite, galena.
Reference: Rocks & Minerals (1995) 70:397; Ronald Januzzi collection.
Pyrite
Formula: FeS2
Colour: brassy
Description: very fine-grained crystal aggregates associated with quartz and sphalerite.
Reference: Harold Moritz collection
Pyromorphite
Formula: Pb5(PO4)3Cl
Habit: acicular, rounded hexagonal aggregates of needles, hexagonal prisms
Colour: green to pale green, cream, white
Description: "fine acicular crystals of pale green pyromorphite (X-rayed Newmont Exploration) associated with galena, wulfenite, cerussite, and iron and manganese oxides. Occurs in several habits ranging from typical prismatic forms to acicular crystals of great beauty." (Januzzi 1994) Found in heavily limonite-stained rock with cubic cavities of former galena crystals.
Reference: Henderson, William A. (1995. Microminerals of Connecticut (Rocks & Minerals 70:420).; Rocks & Minerals (1995) 70:397; Januzzi (1994)
Quartz
Formula: SiO2
Habit: stout to needle-like prisms
Colour: milky to colorless
Description: milky to transparent, massive or in crystals with needle-like ones associated with sphalerite, fluorite, adularia, galena.
Reference: Rocks & Minerals (1995) 70:397; Januzzi (1994)
Rutile
Formula: TiO2
Description: micros in schist
Reference: Rocks & Minerals (1995) 70:397
Scheelite
Formula: Ca(WO4)
Description: reference provides no details, may have been found further north from the hydrothermal vein and closer to Old Mine Park where it is abundant.
Reference: Rocks & Minerals (1995) 70:397
Siderite
Formula: FeCO3
Habit: cleavable masses
Colour: tan to light brown
Description: Massive vein material associated with quartz, galena, pyrite.
Reference: Former Ronald Januzzi collection
Silver
Formula: Ag
Description: trace amounts associated with acanthite
Reference: Henderson, William A. (1995. Microminerals of Connecticut (Rocks & Minerals 70:421).; Rocks & Minerals (1995) 70:397
Sphalerite
Formula: ZnS
Habit: complex aggregates, modified tetrahedrons
Colour: black, dark brown, yellow-brown, greenish brown, yellow
Description: massive dark-colored veins, crystals (micros) show two generations or growth - 1) dark brown complex aggregates and 2) lighter-colored single crystals. Associated with quartz, galena, adularia, fluorite.
Reference: Rocks & Minerals (1995) 70:397, 421; Januzzi (1994)
Wulfenite
Formula: Pb(MoO4)
Habit: tetragonal bipyramids
Colour: brown
Description: micro crystals associated with pyromorphite, cerussite, galena, and quartz
Reference: Henderson, William A. (1995. Microminerals of Connecticut (Rocks & Minerals 70:421).; Rocks & Minerals (1995) 70:397; Januzzi (1994)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Bismuth1.CA.05Bi
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Galena2.CD.10PbS
Greenockite ?2.CB.45CdS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Brookite4.DD.10TiO2
Goethite4.00.α-Fe3+O(OH)
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Dolomite5.AB.10CaMg(CO3)2
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Jarosite7.BC.10KFe3+3(SO4)2(OH)6
Scheelite7.GA.05Ca(WO4)
Wulfenite7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
Pyromorphite8.BN.05Pb5(PO4)3Cl
Group 9 - Silicates
Bertrandite9.BD.05Be4(Si2O7)(OH)2
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Rocks, etc.
'K Feldspar'-
'var: Adularia'-KAlSi3O8

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Silver1.1.1.2Ag
Semi-metals and non-metals
Bismuth1.3.1.4Bi
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Greenockite ?2.8.7.2CdS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX2
Anatase4.4.4.1TiO2
Brookite4.4.5.1TiO2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Pyromorphite41.8.4.1Pb5(PO4)3Cl
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Wulfenite48.1.3.1Pb(MoO4)
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
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)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'K Feldspar'-
'var: Adularia'-KAlSi3O8

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H BertranditeBe4(Si2O7)(OH)2
H Goethiteα-Fe3+O(OH)
H JarositeKFe3+ 3(SO4)2(OH)6
BeBeryllium
Be BertranditeBe4(Si2O7)(OH)2
CCarbon
C CerussitePbCO3
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C SideriteFeCO3
OOxygen
O K Feldspar (var: Adularia)KAlSi3O8
O AnataseTiO2
O RutileTiO2
O PyromorphitePb5(PO4)3Cl
O WulfenitePb(MoO4)
O BrookiteTiO2
O CerussitePbCO3
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O QuartzSiO2
O ScheeliteCa(WO4)
O CalciteCaCO3
O BertranditeBe4(Si2O7)(OH)2
O DolomiteCaMg(CO3)2
O Goethiteα-Fe3+O(OH)
O JarositeKFe3+ 3(SO4)2(OH)6
O SideriteFeCO3
FFluorine
F FluoriteCaF2
MgMagnesium
Mg DolomiteCaMg(CO3)2
AlAluminium
Al K Feldspar (var: Adularia)KAlSi3O8
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si K Feldspar (var: Adularia)KAlSi3O8
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si QuartzSiO2
Si BertranditeBe4(Si2O7)(OH)2
PPhosphorus
P PyromorphitePb5(PO4)3Cl
SSulfur
S SphaleriteZnS
S GalenaPbS
S AcanthiteAg2S
S PyriteFeS2
S JarositeKFe3+ 3(SO4)2(OH)6
S GreenockiteCdS
ClChlorine
Cl PyromorphitePb5(PO4)3Cl
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
K JarositeKFe3+ 3(SO4)2(OH)6
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca FluoriteCaF2
Ca ScheeliteCa(WO4)
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
TiTitanium
Ti AnataseTiO2
Ti RutileTiO2
Ti BrookiteTiO2
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Goethiteα-Fe3+O(OH)
Fe PyriteFeS2
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe SideriteFeCO3
ZnZinc
Zn SphaleriteZnS
MoMolybdenum
Mo WulfenitePb(MoO4)
AgSilver
Ag SilverAg
Ag AcanthiteAg2S
CdCadmium
Cd GreenockiteCdS
WTungsten
W ScheeliteCa(WO4)
PbLead
Pb PyromorphitePb5(PO4)3Cl
Pb GalenaPbS
Pb WulfenitePb(MoO4)
Pb CerussitePbCO3
BiBismuth
Bi BismuthBi

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Hiller, John. (1980), Greenockite in Connecticut. The Thumbnail News: August-September: 2.
Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.
Henderson, William A. (1995), Microminerals of Connecticut. Rocks & Minerals (Connecticut Issue): 70(6): 420-421.
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 397.

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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