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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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Tantalite-(Mn) from
Pulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA


Locality type:Quarry
Classification
Species:Tantalite-(Mn)
Formula:Mn2+Ta2O6
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tantalite-(Mn) data
Locality Data:Click here to view Pulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:33475
Long-form Identifier:1:3:33475:8
GUID (UUID V4):0
Nearest other occurrences of Tantalite-(Mn)
0.1km (0.1 miles) ⓘKeith Quarry (Towne Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.2km (0.1 miles) ⓘGroves Quarry (Hole in the Ground Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.9km (0.6 miles) ⓘSmith Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.9km (0.6 miles) ⓘMaine Feldspar Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
2.0km (1.2 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
24.7km (15.3 miles) ⓘBennett Quarry, Buckfield, Oxford County, Maine, USA
31.8km (19.7 miles) ⓘFisher Quarry, Topsham, Sagadahoc County, Maine, USA
34.4km (21.4 miles) ⓘWaisanen Quarry (Tamminen-Waisanen Quarry), Greenwood, Oxford County, Maine, USA
34.5km (21.4 miles) ⓘTamminen Quarry, Greenwood, Oxford County, Maine, USA
40.6km (25.3 miles) ⓘEmmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
References
King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey.
Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey
 
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