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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
Buckwheat pit, Franklin Mine, Franklin, Sussex County, New Jersey, USA


06027660017363858762452.jpg
Muscovite, etc.

Buckwheat pit, Franklin Mine, Franklin, Sussex County, New Jersey, USA
06027660017363858762452.jpg
Muscovite, etc.

Buckwheat pit, Franklin Mine, Franklin, Sussex County, New Jersey, USA
02818110017363858775289.jpg
Muscovite, etc.

Buckwheat pit, Franklin Mine, Franklin, Sussex County, New Jersey, USA
Locality type:Pit
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Calcite1
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Buckwheat pit, Franklin Mine, Franklin, Sussex County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:52027
Long-form Identifier:1:3:52027:6
GUID (UUID V4):0
Nearest other occurrences of Muscovite
0.1km (0.1 miles) ⓘFranklin Mine, Franklin, Sussex County, New Jersey, USA
0.2km (0.1 miles) ⓘBuckwheat dump mineral collecting site, Franklin Mine, Franklin, Sussex County, New Jersey, USA
0.6km (0.4 miles) ⓘFurnace Quarry, Franklin, Sussex County, New Jersey, USA
1.0km (0.6 miles) ⓘMill site dump, Franklin Mine, Franklin, Sussex County, New Jersey, USA
2.7km (1.7 miles) ⓘFranklin Quarry, Franklin, Sussex County, New Jersey, USA
3.8km (2.3 miles) ⓘSterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
8.5km (5.3 miles) ⓘMcAfee Quarry, McAfee, Vernon Township, Sussex County, New Jersey, USA
10.4km (6.5 miles) ⓘLime Crest Quarry, Sparta Township, Sussex County, New Jersey, USA
12.0km (7.4 miles) ⓘSussex nepheline-syenite sill, Libertyville, Wantage Township, Sussex County, New Jersey, USA
18.8km (11.7 miles) ⓘMase Mountain, Tierneys Corner, Jefferson Township, Morris County, New Jersey, USA
References
Peters, Thomas A., Koestler, Robert, Peters, Joseph J., Grube, Christian H. (1983) Minerals of the Buckwheat Dolomite, Franklin, New Jersey, in May - June 1983. The Mineralogical Record, 14 (3) 183-194
Dunn, Pete J. (1995) Franklin and Sterling Hill, New Jersey: The world's most magnificent mineral deposits Vol. 4. The Franklin-Ogdensburg Mineralogical Society.p.465
 
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