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
Penfield Quarry (Oak Leaf Quarry), Portland, Middlesex County, Connecticut, 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 Penfield Quarry (Oak Leaf Quarry), Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:645147
Long-form Identifier:1:3:645147:9
GUID (UUID V4):0
Nearest other occurrences of Muscovite
0.5km (0.3 miles) ⓘPelton's Quarry, Portland, Middlesex County, Connecticut, USA
0.9km (0.6 miles) ⓘSynnott Quarry, Portland, Middlesex County, Connecticut, USA
1.4km (0.9 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
1.4km (0.9 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
1.6km (1.0 miles) ⓘHale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
1.7km (1.1 miles) ⓘPegmatite prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
2.9km (1.8 miles) ⓘState Forest Quarry No. 1, East Hampton, Middlesex County, Connecticut, USA
3.0km (1.8 miles) ⓘNathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
3.0km (1.8 miles) ⓘGotta-Walden Prospect, Portland, Middlesex County, Connecticut, USA
3.0km (1.9 miles) ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
References
Hanson, S. L., Jarnot, B. M., Falster, A. U., Simmons, W. B., Nizamoff, J. W. (2003) Nb-Ta-Ti oxide minerals from two pegmatites of the Middletown area, Connecticut. Rochester Mineralogical Symposium Abstracts, 11-12.
 
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