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Pyrite from
Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield Co., Connecticut, USA

Classification
Species:Pyrite
Formula:FeS2
Formation:Primary
Comments:Crystals generally very small <2mm, but typically well formed and complex, associated with barite, galena, quartz, sphalerite, stilbite, heulandite. Twinned crystals are very common. Some repeated twins have been found >1 cm. Pyrite aggregates may mimic marcasite crystal groups with rather typical curved faces. Under the microscope they appear as aggregates of small cubes.
Habit:cubic, pyritohedral, octahedral, unusual elongated forms. Penetration twins.
Colour:brass-yellow, sometimes iridescent or with a reddish-brown coating.
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References:Segeler, Curt and Molon, Joseph. (1985), The Thomaston Dam Site, Thomaston, Connecticut; Rocks & Minerals: 60(3): 119-124.; Vogt, Wolfgang. (1991), Rediscovering Thomaston Dam. Lapidary Journal: April.; Zodac, Peter. (1959), Minerals at Thomaston Dam, Connecticut; Rocks & Minerals: 34: 3.
Associated Minerals Based on Photo Data:
Heulandite subgroup7 photos of Pyrite associated with Heulandite subgroup at this locality.
Calcite5 photos of Pyrite associated with Calcite at this locality.
Fluorite4 photos of Pyrite associated with Fluorite at this locality.
Quartz4 photos of Pyrite associated with Quartz at this locality.
Sphalerite3 photos of Pyrite associated with Sphalerite at this locality.
Wurtzite2 photos of Pyrite associated with Wurtzite at this locality.
Harmotome2 photos of Pyrite associated with Harmotome at this locality.
Stilbite subgroup1 photo of Pyrite associated with Stilbite subgroup at this locality.
Data
Mineral Data:Click here to view Pyrite data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield Co., Connecticut, USA
Photo GalleryView Gallery (4 photos)
Nearest other occurrences of Pyrite
5.0km (3.1 miles) Reynolds Bridge, Thomaston, Litchfield Co., Connecticut, USA
5.9km (3.7 miles) Waterbury Road quarry, Thomaston, Litchfield Co., Connecticut, USA
7.7km (4.8 miles) State Route 8 and State Route 118 interchange, Harwinton, Litchfield Co., Connecticut, USA
10.7km (6.7 miles) State Route 8 exit 37, Watertown, Litchfield Co., Connecticut, USA
11.2km (7.0 miles) Blue Stone Quarry, Waterbury, New Haven Co., Connecticut, USA
12.2km (7.6 miles) Bristol Copper Mine, Bristol, Hartford Co., Connecticut, USA
12.3km (7.7 miles) Torrington (Wolcottville), Litchfield Co., Connecticut, USA
15.1km (9.4 miles) Mountain Top Trucking quarry, Torrington (Wolcottville), Litchfield Co., Connecticut, USA
15.9km (9.9 miles) Waterbury, New Haven Co., Connecticut, USA
16.9km (10.5 miles) Mount Prospect complex (Prospect Hill complex; Prospect Mountain complex), Litchfield, Litchfield Co., Connecticut, USA
 
Mineral and/or Locality  
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