Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Antigorite from
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA


00520040017368103269313.jpg
Antigorite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
05970740017368103262681.jpg
Antigorite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
08915500017272033811787.jpg
Antigorite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
05970740017368103262681.jpg
Antigorite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
08915500017272033811787.jpg
Antigorite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
05970740017368103262681.jpg
Antigorite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Locality type:Quarry
Classification
Species:Antigorite
Formula:Mg3(Si2O5)(OH)4
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Chromite2
Magnesite2
Magnetite2
Limonite1
Desautelsite1
Data
Mineral Data:Click here to view Antigorite data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:46586
Long-form Identifier:1:3:46586:3
GUID (UUID V4):0
Nearest other occurrences of Antigorite
5.4km (3.3 miles) ⓘTschiffely (Wheatlands) Aggregate Quarry, Montgomery County, Maryland, USA
52.7km (32.7 miles) ⓘDelight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
59.7km (37.1 miles) ⓘBare Hills Serpentine Quarry East, Bare Hills, Baltimore County, Maryland, USA
88.6km (55.1 miles) ⓘWilkins Mine (Wilkens Mine; John W. Carman Property), Jarretsville-Dublin Mining District, Harford County, Maryland, USA
88.8km (55.2 miles) ⓘReed Mine, Jarretsville-Dublin Mining District, Harford County, Maryland, USA
97.2km (60.4 miles) ⓘCherry Hill Mine, Jarretsville-Dublin Mining District, Harford County, Maryland, USA
References
Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.
 
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