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State Route 25 road cuts, Trumbull, Fairfield Co., Connecticut, USA

Latitude: 41°15'34"N
Longitude: 73°12'27"W
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. 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.

Another place (exact spot unrecorded) along the cuts produced massive siderite, quartz, galena and pyrite, similar to the occurrence at Mine Hill in Roxbury, Connecticut.

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

Mineral List

Acanthite
Anatase
Brookite
Calcite
Cerussite
Dolomite
Epidote
Fluorite
Galena
Goethite
Greenockite
Jarosite
'K Feldspar
var: Adularia'

Pyrite
Pyromorphite
Quartz
Rutile
Scheelite
Siderite
Silver
Sphalerite
Wulfenite


22 entries listed. 21 valid minerals.

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References

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), Vol. 70, No. 6, pp. 420-421.

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Vol. 70, No. 6, p. 397.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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