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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Muscovite from
Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA


Locality type:Quarry
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360650
Long-form Identifier:1:3:360650:6
GUID (UUID V4):0
Nearest other occurrences of Muscovite
7.2km (4.5 miles) ⓘHolmesburg Granite Company Quarry, Holmesburg, Philadelphia, Philadelphia County, Pennsylvania, USA
8.3km (5.2 miles) ⓘGermantown, Philadelphia, Philadelphia County, Pennsylvania, USA
8.4km (5.2 miles) ⓘFowler's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA
8.8km (5.4 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
9.7km (6.0 miles) ⓘRidge Avenue and School Lane Quarries, East Falls, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
10.7km (6.6 miles) ⓘComley's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA
11.7km (7.3 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
13.2km (8.2 miles) ⓘFlat Rock Tunnel, Lower Merion Township, Montgomery County, Pennsylvania, USA
14.7km (9.2 miles) ⓘCampbell's Quarry, Hestonville, Philadelphia County, Pennsylvania, USA
22.8km (14.2 miles) ⓘBroomall, Township of Marple, Delaware County, Pennsylvania, USA
References
Samuel S. Gordon, pg. 229
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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