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
Weber's Quarry, Ellicott City, Howard County, Maryland, 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 Weber's Quarry, Ellicott City, Howard County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:657322
Long-form Identifier:1:3:657322:5
GUID (UUID V4):0
Nearest other occurrences of Muscovite
2.8km (1.7 miles) ⓘMount Saint Clement College Quarry, Ilchester, Howard County, Maryland, USA
4.2km (2.6 miles) ⓘPindell Quarries No. 1, Howard County, Maryland, USA
4.4km (2.7 miles) ⓘFagan Quarries, Howard County, Maryland, USA
4.4km (2.8 miles) ⓘHollofield Feldspar Quarries, Hollofield, Baltimore County, Maryland, USA
4.4km (2.8 miles) ⓘPindell Quarries No. 2, Howard County, Maryland, USA
4.9km (3.0 miles) ⓘHollofield Gabbro Quarries, Hollofield, Baltimore County, Maryland, USA
5.1km (3.2 miles) ⓘO'Connor Farm Quarries, Howard County, Maryland, USA
5.4km (3.4 miles) ⓘHollofield, Baltimore County, Maryland, USA
6.7km (4.2 miles) ⓘArlington No. 2 Quarry, Howard County, Maryland, USA
7.2km (4.5 miles) ⓘArlington No. 1 Quarry, Howard County, Maryland, USA
References
USGS Bull. 426
 
and/or  
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