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White Quarry, Leesburg, Loudoun Co., Virginia, USA

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Latitude & Longitude (WGS84): 39° 6' 35'' North , 77° 33' 41'' West
Latitude & Longitude (decimal): 39.10972,-77.56139
GeoHash:G#: dqby7p9w8
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate

Commodities (Major) - Stone - Crushed/Broken
Development Status: Past Producer

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

7 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

Early Jurassic - Late Triassic
174.1 - 237 Ma

ID: 2460648
thermally metamorphosed rocks

Age: Mesozoic (174.1 - 237 Ma)

Description: Hornfels, metagraywacke, and metaconglomerate. Zoned contact aureoles adjacent to diabase intrusives; dark gray, greenish-gray to olive-black, bluish-gray and mauve hornfels, metagraywacke, quartzite, and metaconglomerate; originally siltstone, impure pebbly sandstone, and conglomerate. Cordierite-spotted hornfels commonly is present at the innermost part of the aureole, with epidote- and chlorite-rich hornfels, metagraywacke, quartzite, and metaconglomerate characteristic of the remainder of the contact zone. The thermal aureole above and beneath the thick HTQ sheets is about 120 m (400 ft) thick, but about 60 m (200 ft) thick enclosing the thinner LTQ sheets. The thermally metamorphosed rocks are generally hard, brittle, and fractured.

Comments: gray, variegated; thin,medium bedded; Secondary joints; cordierite; thermally metamorphosed by contact of diabase; used for aggregate

Lithology: Hornfels

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [69]

201.3 - 252.17 Ma

ID: 3186382
Mesozoic intrusive rocks

Age: Triassic (201.3 - 252.17 Ma)

Comments: Culpeper Subbasin

Lithology: Intrusive igneous rocks

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]

201.3 - 252.17 Ma

ID: 2797042
Newark Supergroup; Conglomerate, greenstone clasts

Age: Triassic (201.3 - 252.17 Ma)

Stratigraphic Name: Newark Supergroup

Description: Rounded to subrounded pebbles, cobbles, and boulders of predominantly metavolcanic Catoctin greenstone in a matrix of fine- to coarse-grained, silicified, ferruginous-cemented, greenish-gray to dark-green, clayey sandstone.

Comments: Mesozoic Basins; paper map and digital map have differernt labels: paper map does not have TR prefix, but the digital source has TR as part of the label.

Lithology: Major:{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.
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