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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.
Heulandite subgroup7 photos of Fluorite associated with Heulandite subgroup 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
Nearest other occurrences of Fluorite
20.3km (12.6 miles) A O & G Woodbury Quarry (Orenaug Quarry; O & G No. 1 Quarry), Orenaug Hills, Woodbury, Litchfield Co., Connecticut, USA
26.5km (16.4 miles) B Rockside Quarry (Mine Hill Quarry), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
28.6km (17.8 miles) C Jinny Hill Mine (Cheshire Barite Mine), Cheshire, New Haven Co., Connecticut, USA
28.7km (17.8 miles) D State Routes 9 and 372 interchange, Berlin, Hartford Co., Connecticut, USA
34.2km (21.3 miles) E State Route 189 road cut, Tariffville Gorge, Bloomfield, Hartford Co., Connecticut, USA
37.8km (23.5 miles) F Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex Co., Connecticut, USA
38.1km (23.7 miles) G Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut, USA
38.8km (24.1 miles) H State Route 20 road cut, East Granby, Hartford Co., Connecticut, USA
40.2km (25.0 miles) I Hollister prospects (Hollister Quarry), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
40.3km (25.1 miles) J Gotta-Walden Prospect, Portland, Middlesex Co., Connecticut, USA
40.9km (25.4 miles) K New England Materials quarry, Monroe, Fairfield Co., Connecticut, USA
40.9km (25.4 miles) L Middletown lead mines (Middletown Mine), Middletown, Middlesex Co., Connecticut, USA
41.2km (25.6 miles) M Schoonmaker Mine (Cramer Mine), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
41.3km (25.6 miles) N Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
41.6km (25.9 miles) O Riverside Quarry (Western Quarry), White Rock District (White Rocks District), Middletown, Middlesex Co., Connecticut, USA
42.0km (26.1 miles) P White Rocks Quarry (Consolidated Quarry), White Rock District (White Rocks District), Middletown, Middlesex Co., Connecticut, USA
42.2km (26.2 miles) Q Tollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex Co., Connecticut, USA
46.7km (29.0 miles) R Corporate Drive road cut, Long Hill, Trumbull, Fairfield Co., Connecticut, USA
47.0km (29.2 miles) S Porter Hill Road roadcut, Long Hill, Trumbull, Fairfield Co., Connecticut, USA
47.2km (29.3 miles) T Old Mine Plaza construction site, Long Hill, Trumbull, Fairfield Co., Connecticut, USA
47.3km (29.4 miles) U Old Mine Park (Lane’s Mine of Trumbull; Lane's New Stratford mine; Hubbard Mine; Long Hill Mine; Old Tungsten Mine), Long Hill, Trumbull, Fairfield Co., Connecticut, USA
47.7km (29.6 miles) V State Route 111 road cuts, Long Hill, Trumbull, Fairfield Co., Connecticut, USA
50.1km (31.1 miles) W State Route 25 road cuts, Trumbull, Fairfield Co., Connecticut, USA
50.5km (31.4 miles) X Linkpot cut, Airline Railroad, East Hampton (Chatham), Middlesex Co., Connecticut, USA
51.6km (32.1 miles) Y Gillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex Co., Connecticut, USA
52.3km (32.5 miles) Z Beaver Meadow Road - State Route 9 Interchange, Haddam, Middlesex Co., Connecticut, USA
52.7km (32.7 miles) 0 Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex Co., Connecticut, USA
52.9km (32.9 miles) 1 Slocum prospect, East Hampton (Chatham), Middlesex Co., Connecticut, USA
53.8km (33.4 miles) 2 Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex Co., Connecticut, USA
54.5km (33.8 miles) 3 Leetes Quarry, Stony Creek, Branford, New Haven Co., Connecticut, USA
56.9km (35.4 miles) 4 Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield Co., Connecticut, USA
57.6km (35.8 miles) 5 Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
61.0km (37.9 miles) 6 Hudson & Chester Quarry, Becket, Berkshire Co., Massachusetts, USA
69.7km (43.3 miles) 7 Shaft 7, Delaware Aqueduct, Fishkill Township, Dutchess Co., New York, USA
69.8km (43.4 miles) 8 Salem, New London Co., Connecticut, USA
70.6km (43.9 miles) 9 Loudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine), Easthampton, Hampshire Co., Massachusetts, USA
Mineral and/or Locality  
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