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

Classification
Species:Calcite
Formula:CaCO3
Formation:Primary
Comments:As scalenohedron crystals, some are doubly terminated, up to one inch. Micro-sized rhombohedral crystals in a quartz vug. But most obvious as very thin white tabular crystals commonly confused with baryte (use acid to tell), usually associated with stilbite and fluorite. "Each plate is dominated by the basal pinacoid (0001) and modified by a rhombohedron, and many plates form a striking pagoda-like stack with the c-axis in optical continuity within the succession. As many as 20 consecutive plates can be in a stack.", Myer. Also as cleavable masses with fluorite and sphalerite.
Habit:scalenohedral, hexagonal tabular, rhombohedral
Colour:white, cream, honey
Luminescent properties:bright orange-red, rose, yellow under SW UV, commonly better under MW UV. Yellow crystals also phosphorescent.
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References:Zodac, Peter. (1959), Minerals at Thomaston Dam, Connecticut; Rocks & Minerals: 34: 3.; Myer, George H. (1962), Hydrothermal Wurtzite at Thomaston Dam, Connecticut. American Mineralogist: 47(7-8): 977-979.; 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:
Fluorite8 photos of Calcite associated with Fluorite at this locality.
Heulandite subgroup7 photos of Calcite associated with Heulandite subgroup at this locality.
Stilbite subgroup6 photos of Calcite associated with Stilbite subgroup at this locality.
Quartz6 photos of Calcite associated with Quartz at this locality.
Pyrite5 photos of Calcite associated with Pyrite at this locality.
Galena4 photos of Calcite associated with Galena at this locality.
Wurtzite2 photos of Calcite associated with Wurtzite at this locality.
Stilbite-Ca1 photo of Calcite associated with Stilbite-Ca at this locality.
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield Co., Connecticut, USA
Nearest other occurrences of Calcite
7.7km (4.8 miles) A State Route 8 and State Route 118 interchange, Harwinton, Litchfield Co., Connecticut, USA
10.7km (6.7 miles) B State Route 8 exit 37, Watertown, Litchfield Co., Connecticut, USA
11.2km (7.0 miles) C Blue Stone Quarry, Waterbury, New Haven Co., Connecticut, USA
12.2km (7.6 miles) D Hurley Hill, Bristol, Hartford Co., Connecticut, USA
12.2km (7.6 miles) E Bristol Copper Mine, Bristol, Hartford Co., Connecticut, USA
12.3km (7.7 miles) F Torrington (Wolcottville), Litchfield Co., Connecticut, USA
15.9km (9.9 miles) G Waterbury, New Haven Co., Connecticut, USA
18.8km (11.7 miles) H State Route 372 construction site, Plainville, Hartford Co., Connecticut, USA
19.9km (12.4 miles) I Interstate 84 interchange 26, Cheshire, New Haven Co., Connecticut, USA
20.0km (12.4 miles) J Tomasso Quarry (Tilcon Tomasso Quarry; Tilcon Quarry; Arborio Quarry), Farmington, Hartford Co., Connecticut, USA
20.0km (12.4 miles) K Plainville Trap Rock Quarry (Tilcon New Britain Quarry), Plainville, Hartford Co., Connecticut, USA
20.0km (12.4 miles) L Trap Rock quarry, Plainville, Hartford Co., Connecticut, USA
20.3km (12.6 miles) M O & G Woodbury Quarry (Orenaug Quarry; O & G No. 1 Quarry), Orenaug Hills, Woodbury, Litchfield Co., Connecticut, USA
20.3km (12.6 miles) N Clark farm (Holler's Mine), Southington, Hartford Co., Connecticut, USA
20.5km (12.7 miles) O North Mountain Road, Plainville, Hartford Co., Connecticut, USA
20.7km (12.8 miles) P Woodbury, Litchfield Co., Connecticut, USA
21.5km (13.4 miles) Q Interstate 691 and State Route 10 Interchange, Cheshire, New Haven Co., Connecticut, USA
21.5km (13.4 miles) R State Route 4 road cut, Farmington, Hartford Co., Connecticut, USA
21.8km (13.6 miles) S New Haven Mineral Company barite mine, Cheshire, New Haven Co., Connecticut, USA
22.2km (13.8 miles) T Farmington Trap Rock Quarry, Farmington, Hartford Co., Connecticut, USA
23.4km (14.5 miles) U Cheshire Traprock Quarry, Cheshire, New Haven Co., Connecticut, USA
23.7km (14.7 miles) V Cheshire Barytes Company barite mine (Stamford Manufacturing Company barite mine), Cheshire, New Haven Co., Connecticut, USA
23.8km (14.8 miles) W O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Southbury, New Haven Co., Connecticut, USA
24.4km (15.1 miles) X Talcott Mountain, Avon, Hartford Co., Connecticut, USA
24.8km (15.4 miles) Y Kyanite locality (Judds Bridge locality), Washington, Litchfield Co., Connecticut, USA
25.2km (15.6 miles) Z State Route 9 - Ellis Street and State Route 72 interchanges (State Route 72 roadcut), New Britain, Hartford Co., Connecticut, USA
25.3km (15.7 miles) 0 State Route 9 & State Route 71 Interchange, New Britain, Hartford Co., Connecticut, USA
25.6km (15.9 miles) 1 Arute Field, New Britain, Hartford Co., Connecticut, USA
25.7km (16.0 miles) 2 Hubbard Park Quartz locality, Meriden, New Haven Co., Connecticut, USA
25.8km (16.0 miles) 3 Hart's Lead Mine, Berlin, Hartford Co., Connecticut, USA
26.0km (16.1 miles) 4 Bates' Rock Road, Southbury, New Haven Co., Connecticut, USA
26.3km (16.4 miles) 5 Fenn Road, Newington, Hartford Co., Connecticut, USA
26.4km (16.4 miles) 6 Pillow lava locality, Meriden, New Haven Co., Connecticut, USA
26.4km (16.4 miles) 7 The Woodlands, Newington, Hartford Co., Connecticut, USA
26.5km (16.4 miles) 8 Rockside Quarry (Mine Hill Quarry), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
26.7km (16.6 miles) 9 Heritage Village, Southbury, New Haven Co., Connecticut, USA
Mineral and/or Locality  
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