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


Locality type:Quarry
Classification
Species:Chrysocolla
Formula:Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Chrysocolla data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:46595
Long-form Identifier:1:3:46595:1
GUID (UUID V4):0
Nearest other occurrences of Chrysocolla
19.8km (12.3 miles) ⓘSterling Copper Occurrence, Sterling, Loudoun County, Virginia, USA
22.2km (13.8 miles) ⓘTheodora Mine, Herndon, Fairfax County, Virginia, USA
36.3km (22.6 miles) ⓘBull Run Quarry, Conklin, Loudoun County, Virginia, USA
39.1km (24.3 miles) ⓘCarroll Mine, Sykesville, Carroll County, Maryland, USA
40.0km (24.9 miles) ⓘSpringfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
44.4km (27.6 miles) ⓘDolyhyde Mine (Dolly Hyde Mine), Libertytown, Frederick County, Maryland, USA
45.0km (28.0 miles) ⓘLiberty Mine, Libertytown, Frederick County, Maryland, USA
47.6km (29.6 miles) ⓘMineral Hill Mine, Louisville, Carroll County, Maryland, USA
54.7km (34.0 miles) ⓘPatapsco Mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Carroll County, Maryland, USA
55.8km (34.7 miles) ⓘJohn Diggs Copper Mine, Carroll County, Maryland, USA
References
Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.
 
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