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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Biotite from
Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA


Locality type:Quarry
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:33211
Long-form Identifier:1:3:33211:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.2km (0.1 miles) ⓘMaine Feldspar Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.5km (0.3 miles) ⓘTurner Quarries, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.9km (0.6 miles) ⓘKeith Quarry (Towne Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
1.0km (0.6 miles) ⓘPulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
1.1km (0.7 miles) ⓘWade Quarry (Androscoggin Tourmaline prospect), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
2.0km (1.3 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
4.8km (3.0 miles) ⓘPhillips Quarry, Minot, Androscoggin County, Maine, USA
6.4km (4.0 miles) ⓘCity quarry, Lewiston, Androscoggin County, Maine, USA
9.0km (5.6 miles) ⓘAlfred Plourde Parkway Quarry, Lewiston, Androscoggin County, Maine, USA
16.7km (10.4 miles) ⓘHibbs Quarry, Mount Rubellite, Hebron, Oxford County, Maine, USA
References
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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