Rockport, Essex Co., Massachusetts, USA

Photo: 2008 Peter Cristofono

Latitude: 42°39'20"N
Longitude: 70°37'13"W

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The town of Rockport was separated from Gloucester and incorporated in 1840. Granite was quarried here beginning in 1823. Interesting minerals occur in granite quarries and other bedrock exposures of alkaline Cape Ann granite and associated pegmatites and miarolitic cavities.

McKinstry (1921) described some of the town's mineralogical highlights: "More than fifty years ago attention was called to the unusual mineral occurrences at Rockport, on Cape Ann, by J. P. Cooke's description of danalite, a new beryllium mineral, and subsequently of cryophyllite, a new lithium mica. Besides being the type locality for these species, the Rockport quarries have afforded an interesting list of rare-earth minerals, and, perhaps most unusual of all, large tabular crystals of fayalite, normally an utter stranger to granitic rocks."

Mineral List

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

71 entries listed. 28 valid minerals. 2 type localities (valid minerals). 1 erroneous literature entry.

Localities in this Region

USA

Massachusetts
- Essex Co.
  - Rockport

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).

Cooke, Josiah P., Jr. (1867): On Cryophyllite. (American Journal of Science and Arts 48:217).

Knowlton, W. J. (1867). On a new mineral from Rockport, Mass. [Cyrtolite](American Journal of Science and Arts, 2nd Series, 44:224-226.)

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

Merrill, George P. (1889): The Collection of Building and Ornamental Stones in the U.S. National Museum, p. 287.

Warren, Charles H. (1903) Anthophyllite [= Ferro-anthophyllite] and Fayalite from Rockport, Mass. (American Journal of Science, 4th series, 16:337)

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

McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).

Palache, Charles (1950): Fayalite at Rockport, Massachusetts. (American Mineralogist 35:877-881).

Dunn, P. (1976): Genthelvite and the helvine group (Mineralogical Magazine 40:627-636).

Lyons, Paul (1976): The Chemistry of Riebeckites of Massachusetts (Mineralogical Magazine 4:473-9).

Bozhilov, K. N. & B. W. Evans (2001): Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study. (American Mineralogist 86(10):1252-1260).

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Jobs in Massachusetts, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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.
Current server date and time: 31st Jan 2012 22:48:51