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Diamond Ledge (West Stafford quartz locality; Stafford Springs quartz locality), Stafford, Tolland Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 58' 27'' North , 72° 21' 9'' West
Latitude & Longitude (decimal): 41.97444,-72.35250
GeoHash:G#: drkwc94wb
Köppen climate type:Dfb : Warm-summer humid continental climate

The initial discovery of this mineralized, brecciated fault zone cutting the Clough Quartzite is unknown, but it was mentioned by Elwell (1940):

This locality was somewhat inaccessible due to many large pine trees growing on the site. The hurricane [presumably of 1938], however, blew them all down and a portable sawmill cut them up into boards. Furthermore a new wood road follows the brook to the locality. The ledge is now an open spot with no trees and easily reached.

After this it may have become more popular, as Zodac reported in 1948:

Some very nice quartz crystals, mostly milky, have been found at Diamond Ledge, and one of the nicest specimens seen was presented to the writer (March 4, 1948) by Albert M. Smith, of Wallingford, Conn. It is 3 x 7 inches in size and consists of 12 large milky quartz crystals (the largest is 1 1/2 inches in diameter and 2 inches long), and many tiny ones, on a massive milky quartz base.

A letter from Mr. Smith gave us the following information on his find:

"Last year, four of us Wallingford boys went to the West Stafford locality where we found a large rock with a deep crack in it. With the aid of a crowbar and sledge hammers we pried it open and to our surprise found a cavity inside that was just full of these crystals."

Other minerals found at the locality are limonite (brown stains on quartz which spoils many crystals), muscovite as tiny flakes in the quartzite, and tiny rock crystals in quartz veins.

Mineral List

3 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

Devonian - Silurian
358.9 - 443.8 Ma

ID: 3186140
Paleozoic sedimentary and volcanic rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

419.2 - 443.8 Ma

ID: 2865283
Clough Quartzite

Age: Silurian (419.2 - 443.8 Ma)

Stratigraphic Name: Clough Quartzite

Description: White, medium-grained, glassy to granular, well-layered quartzite and muscovitic quartzite, locally with garnet; conglomeratic (commonly with tourmaline) in lower part.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium; Bolton Group (Devonian and Silurian)

Lithology: Major:{quartzite}, Minor:{conglomerate}

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

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Elwell, Wilbur J. (1940), Three Connecticut Localities. Rocks & Minerals: 15(9): 298.
Zodac, Peter (1948), Diamond Ledge, West Stafford, Conn. Rocks & Minerals: 23: 611.
Clark, Bill. (2003), Diamond Ledge quartz: Fond memories of a Connecticut collecting site. Rock and Gem: 33(8): 80-82, 90.

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