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


05466890017272736072725.jpg
Chalcedony

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
05466890017272736072725.jpg
Chalcedony

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
05466890017272736072725.jpg
Chalcedony

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Locality type:Quarry
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Actinolite1
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:46616
Long-form Identifier:1:3:46616:3
GUID (UUID V4):0
Nearest other occurrences of Quartz
5.4km (3.3 miles) ⓘTschiffely (Wheatlands) Aggregate Quarry, Montgomery County, Maryland, USA
7.2km (4.5 miles) ⓘFord Mine, Potomac, Montgomery County, Maryland, USA
7.3km (4.5 miles) ⓘStanmore Drive, Potomac, Montgomery County, Maryland, USA
7.5km (4.7 miles) ⓘMontgomery Mine (Potomac Mine), Potomac, Montgomery County, Maryland, USA
8.5km (5.3 miles) ⓘWatson Mine (Anderson Property; Potomac and Watson Mine), Potomac, Montgomery County, Maryland, USA
8.6km (5.4 miles) ⓘHuddlestone Mine, Rockville, Montgomery County, Maryland, USA
9.2km (5.7 miles) ⓘMaryland Mine (Allen shaft), Potomac, Montgomery County, Maryland, USA
10.2km (6.4 miles) ⓘSawyer Mine, Cropley, Montgomery County, Maryland, USA
10.3km (6.4 miles) ⓘHalpine Crushed-schist Quarry, Aspen Hill, Montgomery County, Maryland, USA
10.5km (6.5 miles) ⓘIrma Mine, Cropley, Montgomery 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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