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

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Two drill rigs at the "new" Route 25 construction site.

State Route 25 road cuts, Trumbull, Fairfield Co., Connecticut, USA
Latitude & Longitude (WGS84): 41° 15' 34'' North , 73° 12' 27'' West
Latitude & Longitude (decimal): 41.2594444444, -73.2075

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

22 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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.

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