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Gloucester, Essex Co., Massachusetts, USA
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Latitude: 42°36'57"N
Longitude: 70°39'43"W
 
 
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
Actinolite
Aegirine
Albite
var: Oligoclase
'Allanite'
Ankerite ?
Annite
Anorthite
var: Labradorite
'Anorthoclase'
'Apatite'
Astrophyllite
Augite
'Biotite'
Calcite
Chevkinite-(Ce)
'Chlorite Group'
Chloritoid
'Cryophyllite'
Danalite
Epidote
Fayalite
'Fergusonite'
Ferro-anthophyllite
Ferro-hornblende
Fluorite
var: Yttrocerite
'Gadolinite'
Galena
Gedrite
Goethite
Grunerite
Halite
Hastingsite
Hedenbergite
Hematite
'Hornblende'
'Hypersthene'
Ilmenite
Kaolinite
'Lepidomelane'
'Limonite'
Magnetite
Microcline
var: Amazonite
Molybdenite
'Monazite'
Muscovite
Nepheline
'Olivine'
Opal
var: Opal-AN

Orthoclase
'Perthite'
Phenakite
Pigeonite
'Psilomelane'
Pyrite
Pyrrhotite
Quartz
var: Blue Quartz
Quartz
var: Citrine

var: Smoky Quartz
Rhodochrosite
Riebeckite
Riebeckite Group
var: Crocidolite

Rutile
var: Ilmenorutile
Siderite
var: Manganoan Siderite
Sphalerite
Sulphur
'Tantalite'
Thorite
var: Orangite
Titanite
Zircon
var: Cyrtolite


113 entries listed. 47 valid minerals.

Localities in this Region

USA
USA

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.

References

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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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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