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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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Lithiophilite from
Groves Quarry (Hole in the Ground Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA


Locality type:Quarry
Classification
Species:Lithiophilite
Formula:LiMn2+PO4
Comments:Moore (2000) analyzed lithiophilite from this locality and found the Mn/Mn + Fe ratio was 0.97
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Lithiophilite data
Locality Data:Click here to view Groves Quarry (Hole in the Ground Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:33494
Long-form Identifier:1:3:33494:3
GUID (UUID V4):0
Nearest other occurrences of Lithiophilite
0.1km (0.0 miles) ⓘWade Quarry (Androscoggin Tourmaline prospect), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.2km (0.1 miles) ⓘPulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.3km (0.2 miles) ⓘKeith Quarry (Towne Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
1.1km (0.7 miles) ⓘMaine Feldspar Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
1.2km (0.7 miles) ⓘGreenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
2.1km (1.3 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
15.2km (9.5 miles) ⓘMount Rubellite Quarries, Mount Rubellite, Hebron, Oxford County, Maine, USA
24.0km (14.9 miles) ⓘMount Mica Quarry, Paris, Oxford County, Maine, USA
24.6km (15.3 miles) ⓘBennett Quarry, Buckfield, Oxford County, Maine, USA
26.3km (16.3 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
References
King, Vandall T. (2000) Mineralogy of Maine Vol. 2 - Mining History, Gems, and Geology. Maine Geological Survey.pp.333-336
 
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