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Cinque Quarry, East Haven, New Haven Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 18' 4'' North , 72° 51' 55'' West
Latitude & Longitude (decimal): 41.3011111111, -72.8652777778

A small quarry in Jurassic diabase (trap rock) intrusion, much of it brecciated, with mostly calcite and quartz crystals in the interstitial spaces. Worked since at least the early 1970s until around 1990. It was a fee collecting site (Powell and Vogt, 1987) in the 1980s until at least 1990. Famous for rare quartz 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.

This is the same locality referred to in old notes by John Hiller as the traprock area behind the Weeping Willow Restaurant on Laurel Street.

The site is closed and the land largely reclaimed and developed.

Mineral List

Regional Geology

Middle Jurassic163.5 - 174.1 MaButtress Dolerite

Major:: {diabase},Minor:: {basalt},Incidental:: {gabbro}

Buttress Dolerite - Dark-gray to greenish-gray (weathers brown or gray), medium- to fine-grained, commonly porphyritic, generally massive with well-developed columnar jointing, grading from basalt near contacts to fine-grained gabbro in the interior, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine.

Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins

Triassic201.3 - 252.17 MaTriassic sedimentary


Silurian-Devonian358.9 - 443.8 MaSilurian-Devonian sedimentary rocks

Sedimentary rocks

References for regional geology:

Data provided by Macrostrat.org

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

14 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

Ulrich, William. (1975), A field guide to the Cinque traprock quarry. Lapidary Journal: 28: 1608-1622, 1654.

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.

Powell, Richard C. and Wolfgang Vogt. (1987), Cinque Quarry, A Suburban Site in Connecticut Makes Collecting a Cinch. Rock and Gem: (6): 36-39.

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.

Mineral and/or Locality  
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