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Gloucester, Essex Co., Massachusetts, USA

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Latitude & Longitude (WGS84): 42° 36' 57'' North , 70° 39' 43'' West
Latitude & Longitude (decimal): 42.6158333333, -70.6619444444

A populated place (city) on Cape Ann.

Area granite quarries and other bedrock exposures. Plutonic rocks of Cape Ann include gabbro, foidal syenite, alkali-feldspar syenite and alkali-feldspar granite. Pegmatites and miarolitic cavities are associated with the granite.

Mineral List

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

48 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.


Cooke, Josiah P., Jr. (1866): On Danalite, a new Mineral Species from the Granite of Rockport, Mass. (American Journal of Science and Arts 47:73-78).

Shaler, N. S. (1888): The Geology of Cape Ann, Massachusetts. (U. S. Geological Survey Ninth Annual Report)

Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.

Palache, Charles (1907): Phenacite as an Alteration Product of Danalite from Gloucester, Mass. (American Journal of Science 24:252-255).

Dennen, W. H. (1992): Bedrock geologic map of the Gloucester and Rockport Quadrangles, Essex County, Massachusetts.

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