Latitude: 42°0'18"N
Longitude: 71°27'28"W
Type locality for cumberlandite (titaniferous magnetite melatroctolite). Intruded into the Late Proterozoic Blackstone Group between 620 and 370 mya. Formed by gravitational settling of olivine, titaniferous magnetite and cumulophyric plagioclase-olivine aggregates from an anorthositic gabbro magma. A good view of the parent gabbro can be seen at
http://www.mindat.org/loc-27231.html.
Ore from this locality was mined as early as 1703, and mixed with hematite from Cranston, RI, probably in a foundry in Cumberland RI (Singewald, 1913).
Mineral List
24 entries listed. 17 valid minerals.
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External Links
Hitchcock, Edward (1841). Final report on the geology of Massachusetts, p. 554.
Dana, J. D. (1881). Iron ore of Iron Mine Hill, Cumberland, RI. Am. Jour. Sci. 3rd ser., vol. 22, p. 152.
Wadsworth, M. E. (1881). A microscopic study of the Iron ore or peridotite of Iron Mine Hill, Cumberland, RI. Mus. Comp. Zool., Harvard College Bull. 7, pp. 183-187.
Singewald, Joseph T. Jr. (1913). The Titaniferous Iron Ores in the United States; Their Composition and Economic Value. (Bureau of Mines Bulletin 64), pp. 40-46.
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