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Redstone Granite Quarry (Cherenzia Quarry), Westerly, Washington Co., Rhode Island, USA

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Latitude & Longitude (WGS84): 41° 23' 20'' North , 71° 48' 30'' West
Latitude & Longitude (decimal): 41.38889,-71.80833
Köppen climate type:Cfb : Temperate oceanic climate

Originally a granite quarry, opened in 1880. Now a crushed stone quarry operated by Cherenzia Companies. Rocks occuring here including granite, granite-gneiss, gneiss, amphibolite, schist, pegmatite and aplite. Monchiquite dikes occur in the southeastern area of the quarry and just outside of it in road cuts on CT Route 78. These dikes are notable for containing xenolithic nodules derived from the mantle. (Hermes, 1987)

Mineral List

22 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 Macrostrat.org

Roadian - Kungurian
268.8 - 279.3 Ma
Narragansett Pier Plutonic Suite - granite

Age: Permian (268.8 - 279.3 Ma)

Stratigraphic Name: Narragansett Pier Plutonic Suite

Description: Dark-pink to pale-gray, medium-grained equigranular granite, with lesser granodiorite and quartz monzonite. Composed of microcline, oligoclase, quartz, and accessory biotite, magnetite, ilmenite, apatite, sphene, zircon, monazite, apatite, and allanite; muscovite and garnet locally present; secondary chlorite and calcite. Mainly massive, but locally exhibits faint flow foliation. Cut locally by abundant pegmatite, aplite, and composite aplite-pegmatite of mineralogy similar to the host granite. Unit is a 5 km by 40 km batholith that underlies the southern coast of RI. Intrusion during the latter part of Alleghanian deformation of the Narragansett Basin is indicated by its Permian age, rapid cooling, and field relations. The age of the Narragansett Pier is well constrained by several factors. Brown and others (1978) report a Pennsylvanian fossil contained in an inclusion in the pluton. Radiometric ages of 276 Ma by Kocis and others (1978), 272+/-4 Ma by Hermes and others (1981), and 273+/-2 Ma by Zartman and Hermes (1987) are consistently Early Permian. Structural studies by Mosher (1983) and Reck and Mosther (1988) indicate that intrusion began during the third period of deformation in the Narragansett Basin. Argon release patterns (Dallmeyer, 1982) indicate that the granite and intruded sediments had cooled below argon retention temperatures of hornblende by the Late Permian and of biotite by the Early Triassic. Intruded by the Westerly Granite, which has been radiometrically dated at 276+/-7 Ma. The two granites are probably genetically related based on similarities in age, mineralogy, and geochemistry (Hozik, 1992).

Comments: Part of Avalon Terrane Narragansett Pier Plutonic Suite - intrudes both Hope Valley and Esmond-Dedham subterranes (e.g., stitching pluton). Contains abundant veins of pegmatite too small to be mapped individually. Secondary unit description per RI003. Per printed map: age of rock based on radiometric data from RI007 and RI008.

Lithology: Major:{granite}, Minor:{granodiorite,quartz monzonite}, Incidental:{pegmatite, aplite}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.


Dale, T. N. (1908). The Chief Commercial Granites of Massachusetts, New Hampshire, and Rhode Island, USGS Bulletin 354.

American Mineralogist (1956): 41: 76-81.

Overstreet, William C. (1967). The Geologic Occurrence of Monazite. USGS Professional Paper 530, p. 231.

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

Hermes, O. Don (1987). Geologic Relationships of Permian Narragansett Pier and Westerly Granites and Jurassic Lamprophyric Dike Rocks, Westerly, Rhode Island. Geological Society of America Centennial Field Guide - Northeastern Section, p. 181-186.

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