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State Route 25 road cuts, Trumbull, Fairfield Co., Connecticut, USA
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 entries listed. 21 valid minerals.
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References
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.
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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