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Cheshire Traprock Quarry, Cheshire, New Haven Co., Connecticut, USA
Latitude: 41°30'59"N
Longitude: 72°55'29"W
Longitude: 72°55'29"W
Schooner (1961) calls this area "near Roaring Brook" or just "Roaring Brook", though that feature is 2.4 miles south of the quarry. He references Dana's System of Mineralogy 5th edition (1875), which correctly says Roaring Brook is 14 miles north of New Haven (the quarry is about 16.5). It is unlikely the quarry is that old and because Roaring Brook cuts a gorge through the sill, the falls on the brook is a separate locality.
The most productive area for minerals was at the northwest end. Analcime and natrolite, typically together (with prehnite and fine-grained heulandite), were common there, but are very rare at other traprock quarries in Connecticut.
Some Cheshire specimens have been attributed to the traprock quarries in Woodbury and Southbury, Connecticut but natrolite and analcime are very rare there and the extrusive basalt is very fine-grained or aphanitic. The West Rock sill diabase matrix, being intrusive, is relatively coarse-grained (1-2mm) and the dark augite and light plagioclase grains give it a salt and pepper appearance quite different from the Woodbury/Southbury matrix. Many Cheshire specimens also have a brown stain on the minerals that is unlike the other quarries. This is "limonite" that is easily cleaned off if desired.
Mindat Articles
Mineralogy of the Cheshire Traprock Quarry by Rowan LytleMineral List
| Albite ? Analcime 'Apophyllite' Calcite | 'Chabazite' ? Chalcopyrite 'Chlorite Group' ? Datolite | Epidote ? Gypsum 'Heulandite' Natrolite | Prehnite 'Pumpellyite' Quartz var: Agate |
16 entries listed. 10 valid minerals.
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References
Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Bulletin 51, Hartford, Conn.
Januzzi, Ronald. (1959): The Minerals of Western Connecticut and Southeastern New York State. Taylor Assoc./Mineralogical Press, Danbury.
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Hiller, John, Jr. (1971): Connecticut Mines and Minerals. Privately published.
Ryerson, Kathleen. (1972): Rock Hound's Guide to Connecticut. Chester, Conn.: Pequot Press.
Januzzi, Ronald. (1976): Mineral Localities of Connecticut and Southeastern New York State. Taylor Assoc./Mineralogical Press, Danbury.
Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
Tschernich, Rudy. (1992): Zeolites of the World. Geoscience Press, Phoenix, p.114.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Volume 70, No. 6, p. 403.
Januzzi, Ronald. (1959): The Minerals of Western Connecticut and Southeastern New York State. Taylor Assoc./Mineralogical Press, Danbury.
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Hiller, John, Jr. (1971): Connecticut Mines and Minerals. Privately published.
Ryerson, Kathleen. (1972): Rock Hound's Guide to Connecticut. Chester, Conn.: Pequot Press.
Januzzi, Ronald. (1976): Mineral Localities of Connecticut and Southeastern New York State. Taylor Assoc./Mineralogical Press, Danbury.
Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
Tschernich, Rudy. (1992): Zeolites of the World. Geoscience Press, Phoenix, p.114.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Volume 70, No. 6, p. 403.
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Locality Updated: Trübenbach, Gaming, Mostviertel, Lower Austria, AustriaFrom Harald Schillhammer, 23rd May 2013 08:47:24