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Trumbull, Fairfield Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 14' 34'' North , 73° 12' 4'' West
Latitude & Longitude (decimal): 41.2427777778, -73.2011111111

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Mindat Articles

XRF Analysis of Topaz-Bearing Hydrothermal Veins in Trumbull, Connecticut by Jeremy Zolan

Mineral List

Mineral list contains entries from the region specified including sub-localities

Regional Geology

Devonian - Silurian358.9 - 443.8 MaSilurian-Devonian sedimentary


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

Sedimentary rocks

Middle Ordovician - Early Ordovician458.4 - 485.4 MaCarringtons Pond Member [of Trap Falls Formation]

Major:: {schist},Minor:: {gneiss},Incidental:: {amphibolite}

Carringtons Pond Member [of Trap Falls Formation] - Interlayered medium- to dark-gray, rusty-weathering, medium-grained schist and light-gray, fine- to medium-grained gneiss, composed of quartz, sodic plagioclase, biotite, muscovite, and garnet; schist locally contains sillimanite or kyanite; gneiss locally contains K-feldspar; amphibolite layers common.

Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Hartland Belt. Part of Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations) (Middle Ordovician).

References for regional geology:

Data provided by

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.

86 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on 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 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.


Manchester, J.G. (1931): The Minerals of New York City & Its Environs, New York Mineralogical Club Bull.: 3(1): 95.

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