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
Wissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA


Locality type:Valley
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Almandine11
Staurolite5
Quartz2
Kyanite1
Tourmaline1
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Wissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:320598
Long-form Identifier:1:3:320598:3
GUID (UUID V4):0
Nearest other occurrences of Muscovite
2.0km (1.3 miles) ⓘComley's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA
3.4km (2.1 miles) ⓘFlat Rock Tunnel, Lower Merion Township, Montgomery County, Pennsylvania, USA
3.4km (2.1 miles) ⓘGermantown, Philadelphia, Philadelphia County, Pennsylvania, USA
3.6km (2.2 miles) ⓘFowler's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA
4.9km (3.0 miles) ⓘRidge Avenue and School Lane Quarries, East Falls, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
5.8km (3.6 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
9.5km (5.9 miles) ⓘCampbell's Quarry, Hestonville, Philadelphia County, Pennsylvania, USA
11.7km (7.3 miles) ⓘBarber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
14.8km (9.2 miles) ⓘKing of Prussia, Upper Merion Township, Montgomery County, Pennsylvania, USA
15.2km (9.4 miles) ⓘBroomall, Township of Marple, Delaware County, Pennsylvania, USA
References
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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