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Diamond Hill, Cumberland, Providence Co., Rhode Island, USA

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Latitude & Longitude (WGS84): 41° 59' North , 71° 24' West
Latitude & Longitude (decimal): 41.9833333333, -71.4

A prominent hill covering about one-third of a square mile, at least one-third of which is either quartz or highly silicified felsite. The quartz was formerly quarried, crushed and powdered for use as road metal, poultry grit, roofing gravels, fireproof brick and fire sand. It was also used as crushed stone for concrete (Warren and Powers, 1914).

Felsite is mostly light green to gray ignimbrites and ash flow tuffs of the Late Proterozoic Esmond Igneous Suite.

Epimorphs of quartz after barite (and fluorite) are frequently found.

Mineral List

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

14 valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

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.


Polehampton, Edward T. W. (1815): The Gallery of Nature and Art, Vol. II (London: R. Wilks), p. 317.

Robinson, Samuel (1825): A Catalogue of American Minerals, with Their Localities, p. 80.

Jackson, Charles T. (1840). Report on the geological and agricultural survey of the State of Rhode-Island (Providence: B. Cranston), p. 51-52.

Kunz G. F. (1892) Gems and Precious Stones of North America. (NY: The Scientific Publishing Company),p. 133.

Barber, Raymond J. and Mears, Henry S. (1906): An investigation of the quartz deposit at Diamond Hill, R.I. (Massachusetts Institute of Technology, Dept. of Mining Engineering and Metallurgy).

Emerson, B. K. and Perry, J. H. (1907). The green schists and associated granites and porphyries of Rhode Island. (USGS Bulletin 311), p. 56.

Warren, C. H. and Powers, Sidney (1914). Geology of the Diamond Hill - Cumberland District in Rhode Island - Massachusetts. (Bulletin of the Geological Society of America 25:435-476).

Fisher, Lloyd W. and Gedney,Edwin K. (1926): Notes on the mineral localities of Rhode Island; I. Providence County (American Mineralogist 11:334-340)

Miller, C.E.(1971): Rhode Island Minerals and Their Locations, O. D. Hermes, Ed. (University of Rhode Island, Kingston)

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