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Rockport, Essex Co., Massachusetts, USA
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Latitude: 42°39'20"N
Longitude: 70°37'13"W
 
 
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
Albite
'Albite-Anorthite Series'
'Allanite'
Annite (TL)
'Apatite'
Astrophyllite
Augite
'Biotite'
Calcite
'Chlorite Group'
'Cryophyllite'
Danalite (TL)
Fayalite
'Fergusonite'
Fergusonite-(Y)
Ferro-anthophyllite
Fluorite
var: Yttrocerite
Galena
Genthelvite
Grunerite
Hastingsite
Hedenbergite
Hematite
'Hornblende'
Ilmenite
'Lepidomelane'
'Limonite'
Magnetite
Microcline
var: Amazonite
Minnesotaite
Molybdenite
Muscovite
Orthoclase
Pyrite
Pyrrhotite
Quartz
var: Blue Quartz
var: Citrine
var: Rock Crystal
var: Smoky Quartz
'Tantalite'
Thorite
var: Orangite
Zircon
var: Cyrtolite
Zirconolite
var: Polymignite



67 entries listed. 28 valid minerals. 2 type localities (valid minerals).

Localities in this Region

USA

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References

Cooke, Josiah P., Jr. (1866): On Danalite, a new Mineral Species from the Granite of Rockport, Massachusetts, 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, Massachusetts [Cyrtolite], American Journal of Science and Arts, 2nd Series, 44: 224-226.

Shaler, N. S. (1888): The Geology of Cape Ann, Massachusetts, USGS 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, Massachusetts, 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: 473-479.

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 1993-2014. 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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