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Diamond Hill, Cumberland, Providence Co., Rhode Island, USA
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Latitude: 41°59'N
Longitude: 71°24'W
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
'Feldspar Group'
'K Feldspar
var: Adularia'

var: Agate

var: Agate-Jasper
var: Amethyst
var: Bloodstone
var: Chalcedony
var: Citrine
var: Jasper
var: Milky Quartz
var: Onyx
var: Prase

var: Rock Crystal
var: Sardonyx
var: Smoky Quartz

38 entries listed. 14 valid minerals.

Localities in this Region


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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.

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).

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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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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