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Cinque quarry, East Haven, New Haven Co., Connecticut, USA
A small quarry in Jurassic diabase (trap rock) intrusion, much of it brecciated, with mostly calcite, quartz crystals in the interstitial spaces. Worked since at least the early 1970s until around 1990. Famous for rare amethyst on calcite "skunks" and abundant nice micro fibrous goethite and rosette hematite crystals developed on and in the calcite and quartz. Also noted for the presence of tachylite (igneous glass), which is very rare older than the Cretaceous as it devitrifies over geologic time.
The site is closed and the land largely reclaimed and developed.
Mineral List
| Albite Baryte Calcite Chalcopyrite | 'Chlorite Group' Goethite Gypsum Hematite | Marcasite Prehnite Pyrite Quartz | Quartz var: Amethyst var: Smoky Quartz Talc |
15 entries listed. 12 valid minerals.
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References
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Januzzi and Seaman (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.
Webster, Bud. (1978): Mineral Collector’s Field Guide Connecticut.
Henderson, William, A. Jr. and Carl A. Francis. (1989), On Right Angle Bends in Filiform Pyrite. Mineralogical Record: 20(6): 463.
Januzzi, Ronald. E. (1994): Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.
Januzzi and Seaman (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.
Webster, Bud. (1978): Mineral Collector’s Field Guide Connecticut.
Henderson, William, A. Jr. and Carl A. Francis. (1989), On Right Angle Bends in Filiform Pyrite. Mineralogical Record: 20(6): 463.
Januzzi, Ronald. E. (1994): Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.
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New Locality Added: Pernegger Graben, Horn, Waldviertel, Lower Austria, AustriaFrom Peter Neschen, 25th May 2013 08:37:50