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
Bullock Quarry (Geo. Bullock Quarry; George Bullock Quarry), West Conshohocken, Montgomery County, Pennsylvania, USA


Locality type:Quarry
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Bullock Quarry (Geo. Bullock Quarry; George Bullock Quarry), West Conshohocken, Montgomery County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360503
Long-form Identifier:1:3:360503:5
GUID (UUID V4):0
Nearest other occurrences of Quartz
3.2km (2.0 miles) ⓘHenderson Station, Upper Merion Township, Montgomery County, Pennsylvania, USA
3.4km (2.1 miles) ⓘLimestone quarry, Upper Merion Township, Montgomery County, Pennsylvania, USA
3.7km (2.3 miles) ⓘSpring Mill Iron Ore pits, Whitemarsh Township, Montgomery County, Pennsylvania, USA
3.8km (2.3 miles) ⓘBridgeport, Bridgeport Borough, Montgomery County, Pennsylvania, USA
5.6km (3.5 miles) ⓘKing of Prussia, Upper Merion Township, Montgomery County, Pennsylvania, USA
6.8km (4.2 miles) ⓘD.O. Hitner's Mine, Whitemarsh Township, Montgomery County, Pennsylvania, USA
9.3km (5.8 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
10.1km (6.3 miles) ⓘHitner's Marble Quarry (Hitner's Quarry), Whitemarsh Township, Montgomery County, Pennsylvania, USA
10.9km (6.8 miles) ⓘComley's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA
10.9km (6.8 miles) ⓘOreland, Springfield Township, Montgomery County, Pennsylvania, USA
References
Samuel S. Gordon, pg. 216
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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