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Diamond Ledge (West Stafford quartz locality; Stafford Springs quartz locality), Stafford, Tolland Co., Connecticut, USAi
Regional Level Types
Diamond Ledge (West Stafford quartz locality; Stafford Springs quartz locality)- not defined -
Stafford- not defined -
Tolland Co.County

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Lock Map
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
Nearest Settlements:
Stafford Springs4,988 (2017)4.7km
Crystal Lake1,945 (2017)5.2km
Stafford12,029 (2017)5.4km
Somers1,789 (2017)7.8km
Hampden5,261 (2017)11.2km

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.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: α-Fe3+O(OH)
Habit: encrustations
Colour: dark brown
Description: Dark brown encrusting layer typically covering the quartz when found, usually cleaned off.
Reference: Harold Moritz collection
Formula: CaAl2Si4O12 · 4H2O
Habit: acicular
Description: Crystals epimorphed by radial-growth quartz, then later dissolved leaving molds with rectangular cross-sections.
Reference: Harold Moritz collection
Formula: SiO2
Habit: stubby prismatic, complex parallel-growth, corn cob
Colour: colorless to milky (typically in an outer zone)
Description: large complex crystals to 10 cm or more, smaller crystals radially encrusted acicular laumontite creating coarse columns of crystals
Reference: Zodac, Peter (1948), Diamond Ledge, West Stafford, Conn. Rocks & Minerals: 23: 611.
Quartz var: Milky Quartz
Formula: SiO2
Habit: stubby prismatic, complex parallel-growth, corn cob
Colour: colorless to milky
Description: large complex crystals to 10 cm or more, smaller crystals radially encrusted acicular laumontite creating coarse columns of crystals
Reference: Zodac, Peter (1948), Diamond Ledge, West Stafford, Conn. Rocks & Minerals: 23: 611.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
var: Milky Quartz4.DA.05SiO2
Group 9 - Silicates
Laumontite9.GB.10CaAl2Si4O12 · 4H2O

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Unclassified Minerals, Mixtures, etc.
var: Milky Quartz

List of minerals for each chemical element

H LaumontiteCaAl2Si4O12 · 4H2O
H Goethiteα-Fe3+O(OH)
O QuartzSiO2
O Quartz (var: Milky Quartz)SiO2
O LaumontiteCaAl2Si4O12 · 4H2O
O Goethiteα-Fe3+O(OH)
Al LaumontiteCaAl2Si4O12 · 4H2O
Si QuartzSiO2
Si Quartz (var: Milky Quartz)SiO2
Si LaumontiteCaAl2Si4O12 · 4H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Fe Goethiteα-Fe3+O(OH)

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

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) Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) 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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