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

Classification
Species:Fluorite
Formula:CaF2
Formation:Primary
Comments:Very common in hydrothermal fault veins as coarse crystalline masses, found with most minerals present in these veins: quartz, calcite, galena, sphalerite, pyrite, zeolites, with open spaces lined by tightly packed, rough-surfaced (from many small sub-faces) crystals. Crystals to 7 cm were removed intact during the initial blasting of the railroad cut. As well-formed euhedral isolated crystals in voids with other minerals usually up to 2 cm.
Habit:cubic, sometimes modified by dodecahedron and tetrahexahedron
Colour:purple and green shades to colorless, usually in layers
Luminescent properties:blue-white to purplish blue under SW UV, often zoned with the daylight color.
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References:Fluorite: The Collector's Choice. Extra Lapis English No. 9; Rocks & Minerals (1995) 70:396-409; Zodac, Peter. (1959), Minerals at Thomaston Dam, Connecticut; 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.
Associated Minerals Based on Photo Data:
Galena13 photos of Fluorite associated with Galena at this locality.
Calcite8 photos of Fluorite associated with Calcite at this locality.
Wurtzite8 photos of Fluorite associated with Wurtzite at this locality.
Heulandite7 photos of Fluorite associated with Heulandite at this locality.
Quartz7 photos of Fluorite associated with Quartz at this locality.
Stilbite subgroup5 photos of Fluorite associated with Stilbite subgroup at this locality.
Baryte4 photos of Fluorite associated with Baryte at this locality.
Pyrite4 photos of Fluorite associated with Pyrite at this locality.
Phillipsite2 photos of Fluorite associated with Phillipsite at this locality.
Milky Quartz1 photo of Fluorite associated with Milky Quartz at this locality.
Data
Mineral Data:Click here to view Fluorite data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield Co., Connecticut, USA
Photo GalleryView Gallery (18 photos)
Nearest other occurrences of Fluorite
20.3km (12.6 miles) O & G Woodbury Quarry (Orenaug Quarry; O & G No. 1 Quarry), Orenaug Hills, Woodbury, Litchfield Co., Connecticut, USA
26.5km (16.4 miles) Rockside Quarry (Mine Hill Quarry), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
28.6km (17.8 miles) Jinny Hill Mine (Cheshire Barite Mine), Cheshire, New Haven Co., Connecticut, USA
28.7km (17.8 miles) State Routes 9 and 372 interchange, Berlin, Hartford Co., Connecticut, USA
34.2km (21.3 miles) State Route 189 road cut, Tariffville Gorge, Bloomfield, Hartford Co., Connecticut, USA
37.8km (23.5 miles) Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex Co., Connecticut, USA
38.1km (23.7 miles) Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut, USA
38.8km (24.1 miles) State Route 20 road cut, East Granby, Hartford Co., Connecticut, USA
40.2km (25.0 miles) Hollister prospects (Hollister Quarry), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
40.3km (25.1 miles) Gotta-Walden Prospect, Portland, Middlesex Co., Connecticut, USA
 
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