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
Hitner's Marble Quarry (Hitner's Quarry), Whitemarsh Township, Montgomery County, Pennsylvania, USA


Locality type:Quarry
Classification
Species:Calcite
Formula:CaCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view Hitner's Marble Quarry (Hitner's Quarry), Whitemarsh Township, Montgomery County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360489
Long-form Identifier:1:3:360489:2
GUID (UUID V4):0
Nearest other occurrences of Calcite
3.3km (2.0 miles) ⓘHighway Materials Quarry (Old Corson Quarry), Whitemarsh Township, Montgomery County, Pennsylvania, USA
6.7km (4.1 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
9.4km (5.8 miles) ⓘFlat Rock Tunnel, Lower Merion Township, Montgomery County, Pennsylvania, USA
10.1km (6.3 miles) ⓘBullock Quarry (Geo. Bullock Quarry; George Bullock Quarry), West Conshohocken, Montgomery County, Pennsylvania, USA
12.0km (7.5 miles) ⓘLimestone quarry, Upper Merion Township, Montgomery County, Pennsylvania, USA
12.3km (7.6 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
12.5km (7.7 miles) ⓘHenderson Station, Upper Merion Township, Montgomery County, Pennsylvania, USA
14.3km (8.9 miles) ⓘKing of Prussia, Upper Merion Township, Montgomery County, Pennsylvania, USA
14.3km (8.9 miles) ⓘJerry O'Neill's Quarry, Tacony Creek Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
14.3km (8.9 miles) ⓘHoffman's Quarry (Hoffmans Quarry), Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
References
Samuel S. Gordon, pg. 218
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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