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
New London Mine (Linganore Mine), New London, Frederick County, Maryland, USA


Locality type:Mine
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 New London Mine (Linganore Mine), New London, Frederick County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:201967
Long-form Identifier:1:3:201967:3
GUID (UUID V4):0
Nearest other occurrences of Muscovite
17.1km (10.6 miles) ⓘUnion Bridge Quarry & Cement Plant, Union Bridge, Carroll County, Maryland, USA
20.5km (12.7 miles) ⓘU.S 40 Roadcut, Catoctin Mountain, Myersville, Frederick County, Maryland, USA
20.8km (12.9 miles) ⓘEtchison Mine, Montgomery County, Maryland, USA
29.1km (18.1 miles) ⓘMineral Hill Mine, Louisville, Carroll County, Maryland, USA
31.4km (19.5 miles) ⓘHenryton, Carroll County, Maryland, USA
31.4km (19.5 miles) ⓘHenryton Pegmatite prospect, Henryton, Carroll County, Maryland, USA
31.8km (19.7 miles) ⓘDevries Quarry No. 1, Henryton, Carroll County, Maryland, USA
34.7km (21.6 miles) ⓘMarriottsville Quarry, Hernwood, Baltimore County, Maryland, USA
34.9km (21.7 miles) ⓘBrighton Dam Road Quarry (Howard-Montgomery Quarry), Howard County, Maryland, USA
35.1km (21.8 miles) ⓘMarriottsville flagstone Quarries, Baltimore County, Maryland, USA
References
Pearre and Heyl (1965)
 
and/or  
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