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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Chalcocite from
New London Mine (Linganore Mine), New London, Frederick County, Maryland, USA


Locality type:Mine
Classification
Species:Chalcocite
Formula:Cu2S
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcocite data
Locality Data:Click here to view New London Mine (Linganore Mine), New London, Frederick County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:149782
Long-form Identifier:1:3:149782:3
GUID (UUID V4):0
Nearest other occurrences of Chalcocite
5.8km (3.6 miles) ⓘHammond Prospect (Pittinger Prospect), Frederick County, Maryland, USA
6.6km (4.1 miles) ⓘHines Prospects, Frederick County, Maryland, USA
7.1km (4.4 miles) ⓘDolyhyde Mine (Dolly Hyde Mine), Libertytown, Frederick County, Maryland, USA
7.4km (4.6 miles) ⓘLiberty Mine, Libertytown, Frederick County, Maryland, USA
8.6km (5.3 miles) ⓘUnionville Mine, Frederick County, Maryland, USA
11.7km (7.3 miles) ⓘRepp Mine, Frederick County, Maryland, USA
16.7km (10.4 miles) ⓘRoop Mine, New Windsor, Carroll County, Maryland, USA
18.1km (11.2 miles) ⓘJohn Diggs Copper Mine, Carroll County, Maryland, USA
18.8km (11.7 miles) ⓘRobert D. Repp Prospect (Portland Cement Company), Carroll County, Maryland, USA
25.5km (15.8 miles) ⓘSpringfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
References
Rocks & Min.: 22: 226-227.
 
and/or  
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