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
Springfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA


Locality type:Mine
Classification
Species:Calcite
Formula:CaCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view Springfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:201947
Long-form Identifier:1:3:201947:5
GUID (UUID V4):0
Nearest other occurrences of Calcite
7.6km (4.7 miles) ⓘMineral Hill Mine, Louisville, Carroll County, Maryland, USA
9.2km (5.7 miles) ⓘMarriottsville Quarry, Hernwood, Baltimore County, Maryland, USA
10.6km (6.6 miles) ⓘWoodstock, Howard County, Maryland, USA
11.3km (7.0 miles) ⓘWeir Mine, Holbrook, Baltimore County, Maryland, USA
11.6km (7.2 miles) ⓘHarris Mine, Holbrook, Baltimore County, Maryland, USA
14.0km (8.7 miles) ⓘDelight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
17.6km (10.9 miles) ⓘSouthern Pit, Hollofield Gabbro Quarries, Hollofield, Baltimore County, Maryland, USA
18.3km (11.4 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
19.4km (12.0 miles) ⓘMedford Quarry, Medford, Carroll County, Maryland, USA
19.8km (12.3 miles) ⓘEllicott City, Howard County, Maryland, USA
References
Mines of the Washington D.C Area
 
and/or  
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