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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Calcite from
McMahon Quarry (Greenspring Quarry), Pikesville, Baltimore County, Maryland, USA


Locality type:Quarry
Classification
Species:Calcite
Formula:CaCO3
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Pyrrhotite2
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view McMahon Quarry (Greenspring Quarry), Pikesville, Baltimore County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:201800
Long-form Identifier:1:3:201800:3
GUID (UUID V4):0
Nearest other occurrences of Calcite
2.4km (1.5 miles) ⓘBare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore County, Maryland, USA
6.0km (3.7 miles) ⓘWoodberry Quarry, Woodberry, Baltimore City, Maryland, USA
9.2km (5.7 miles) ⓘJones Falls Quarries, Baltimore City, Maryland, USA
9.9km (6.2 miles) ⓘMartin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA
10.8km (6.7 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
11.0km (6.9 miles) ⓘBeaver Dam Quarry (Baker and Connelly Quarry), Cockeysville, Baltimore County, Maryland, USA
11.9km (7.4 miles) ⓘSouthern Pit, Hollofield Gabbro Quarries, Hollofield, Baltimore County, Maryland, USA
13.0km (8.1 miles) ⓘMinebank Run, Loch Raven, Carney, Baltimore County, Maryland, USA
13.0km (8.1 miles) ⓘLoch Raven Reservoir, Baltimore County, Maryland, USA
13.4km (8.3 miles) ⓘDelight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
References
Bernstein, Lawrence R. (1976) Minerals of Washington, D.C. and vicinity. Open-File Report Vol. 76-849. US Geological Survey doi:10.3133/ofr76849
 
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