Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

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

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 41° 59' North , 71° 24' West
Latitude & Longitude (decimal): 41.98333,-71.40000

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.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

298.9 - 323.2 Ma
Narragansett Bay Group - Rhode Island Formation

Age: Pennsylvanian (298.9 - 323.2 Ma)

Stratigraphic Name: Rhode Island Formation

Description: In northern Rhode Island, consists of gray to black, fine- to coarse-grained quartz arenite, litharenite, shale, and conglomerate, with minor beds of anthracite and meta-anthracite. In southern Rhode Island, consists of meta-sandstone, meta-conglomerate, schist, carbonaceous schist, and graphite. Plant fossils are common.

Comments: Part of Esmond-Dedham Subterrane. Narragansett Bay Group - deposited upon older rocks of both West Bay and East Bay parts of the Esmond-Dedham subterrane.

Lithology: Incidental:{anthracite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region


This page 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)

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 24, 2017 12:27:03 Page generated: October 14, 2017 13:37:58
Go to top of page