State Route 25 road cuts, Trumbull, Fairfield County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| State Route 25 road cuts | Group of Road Cuttings |
| Trumbull | Town |
| Fairfield County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 15' 33'' North , 73° 12' 26'' West
Latitude & Longitude (decimal):
Type:
Group of Road Cuttings
KΓΆppen climate type:
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| New Haven Mineral Club | New Haven, Connecticut | 24km |
| Danbury Mineralogical Society | Danbury, Connecticut | 25km |
| Stamford Mineralogical Society | Stamford, Connecticut | 36km |
| Lapidary and Mineral Society of Central Connecticut | Meriden, Connecticut | 46km |
Mindat Locality ID:
126717
Long-form identifier:
mindat:1:2:126717:7
GUID (UUID V4):
faa1872e-db31-4311-8c2d-3f27f7e648a5
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 Gallery Strunz Chemical ElementsDetailed Mineral List:
| β Acanthite Formula: Ag2S Description: in "trace amounts" pseudomorphed after argentite |
| β Anatase Formula: TiO2 Description: micros in schist References: |
| β Bertrandite Formula: Be4(Si2O7)(OH)2 |
| β Bismuth Formula: Bi Habit: massive, striated Colour: tarnished bronze Description: Small mass, <2 cm, in massive quartz. References: |
| β Brookite Formula: TiO2 Description: micros in schist References: |
| β Calcite Formula: CaCO3 References: |
| β 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 References: |
| β 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. |
| β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) Description: reference provides no details, probably in the host schist References: |
| β 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 References: |
| β 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. |
| β Goethite Formula: Ξ±-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. References: |
| β 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 βProbably 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.β Perhaps impure smithsonite. |
| β Jarosite Formula: KFe3+3(SO4)2(OH)6 Habit: massive, earthy Colour: orange-yellow Description: earthy crusts on fractures in massive smoky quartz References: |
| β 'K Feldspar' Habit: well-terminated prismatic micros Colour: white Description: micro crystals associated with quartz, sphalerite, fluorite, galena. |
| β 'K Feldspar var. Adularia' Formula: KAlSi3O8 Habit: well-terminated prismatic micros Colour: white Description: micro crystals associated with quartz, sphalerite, fluorite, galena. |
| β Pyrite Formula: FeS2 Colour: brassy Description: very fine-grained crystal aggregates associated with quartz and sphalerite. References: |
| β 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. |
| β 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. References: |
| β Rutile Formula: TiO2 Description: micros in schist References: |
| β 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. References: |
| β Siderite Formula: FeCO3 Habit: cleavable masses Colour: tan to light brown Description: Massive vein material associated with quartz, galena, pyrite. References: |
| β Silver Formula: Ag Description: trace amounts associated with acanthite |
| β 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. |
| β Wulfenite Formula: Pb(MoO4) Habit: tetragonal bipyramids Colour: brown Description: micro crystals associated with pyromorphite, cerussite, galena, and quartz |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Silver | 1.AA.05 | Ag |
| β | Bismuth | 1.CA.05 | Bi |
| Group 2 - Sulphides and Sulfosalts | |||
| β | Acanthite | 2.BA.35 | Ag2S |
| β | Sphalerite | 2.CB.05a | ZnS |
| β | Greenockite ? | 2.CB.45 | CdS |
| β | Galena | 2.CD.10 | PbS |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 3 - Halides | |||
| β | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Goethite | 4.00. | Ξ±-Fe3+O(OH) |
| β | Quartz | 4.DA.05 | SiO2 |
| β | Rutile | 4.DB.05 | TiO2 |
| β | Anatase | 4.DD.05 | TiO2 |
| β | Brookite | 4.DD.10 | TiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Calcite | 5.AB.05 | CaCO3 |
| β | Siderite | 5.AB.05 | FeCO3 |
| β | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| β | Cerussite | 5.AB.15 | PbCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| β | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
| β | Scheelite | 7.GA.05 | Ca(WO4) |
| β | Wulfenite | 7.GA.05 | Pb(MoO4) |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| β | Pyromorphite | 8.BN.05 | Pb5(PO4)3Cl |
| Group 9 - Silicates | |||
| β | Bertrandite | 9.BD.05 | Be4(Si2O7)(OH)2 |
| β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Unclassified | |||
| β | 'K Feldspar var. Adularia' | - | KAlSi3O8 |
| β | '' | - | |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Piedmontia DomainDomain
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References
