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
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA


Locality type:Quarry
Classification
Species:Chalcocite
Formula:Cu2S
Comments:ACTINOLITE.
ALBITE. (Reported by J. Griesbach, 1975).
ANTHOPHYLLITE. Creamy gray veinlets in serpentinite float.
ANTIGORITE. (G. T. Faust, 1967). Constitutes bulk of serpentinite as interlocking microscopic laths and plates or as tough, brittle, dark
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcocite data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:36808
Long-form Identifier:1:3:36808:3
GUID (UUID V4):0
Nearest other occurrences of Chalcocite
26.9km (16.7 miles) ⓘChantilly Prospect A, Culpeper Basin, Fairfax County, Virginia, USA
28.9km (18.0 miles) ⓘSpencer Farm Prospect, Culpeper Basin, Fairfax County, Virginia, USA
36.3km (22.5 miles) ⓘFairfax Quarry, Centreville, Culpeper Basin, Fairfax County, Virginia, USA
38.4km (23.8 miles) ⓘNew London Mine (Linganore Mine), New London, Frederick County, Maryland, USA
40.0km (24.9 miles) ⓘSpringfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
43.9km (27.3 miles) ⓘHammond Prospect (Pittinger Prospect), Frederick County, Maryland, USA
44.4km (27.6 miles) ⓘDolyhyde Mine (Dolly Hyde Mine), Libertytown, Frederick County, Maryland, USA
44.6km (27.7 miles) ⓘUnionville Mine, Frederick County, Maryland, USA
44.6km (27.7 miles) ⓘHines Prospects, Frederick County, Maryland, USA
45.0km (28.0 miles) ⓘLiberty Mine, Libertytown, Frederick County, Maryland, USA
References
Jack Nelson, Compiler from two references and personal communications, May 2000 (See descriptive notes for quarry for reference citations)>
 
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