In 1957 and 1958, during the construction of a flood control dam on the Naugatuck river about 112 miles north of Thomaston, a railroad cut was made along the west side of the dam. This cut exposes pockets and veins of hydrothermal mineralization in the Hartland formation (Rodgers, et at. 1959, p. 33-34). Within the fracture zone there is a vein about five feet wide, which is entirely fluorite. Minerals in adjacent cavities include quartz, fluorite, calcite, wurtzite, sphalerite, galena and calcic zeolites. Where an offshoot veinlet of fluorite traverses a nearby simple pegmatite, about 35 feet away, a pod of pink montmorillonite occurs.

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