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
E. P. Thomas Quarry, Phippsburg, Sagadahoc 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 E. P. Thomas Quarry, Phippsburg, Sagadahoc County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:32973
Long-form Identifier:1:3:32973:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.1km (0.7 miles) ⓘParker Head Quarry, Parker Head, Phippsburg, Sagadahoc County, Maine, USA
3.0km (1.9 miles) ⓘPerkins Island beryl locality, Georgetown, Sagadahoc County, Maine, USA
3.4km (2.1 miles) ⓘConsolidated Feldspar Quarries, Georgetown, Sagadahoc County, Maine, USA
3.4km (2.1 miles) ⓘHoward-Collins Quarry, Georgetown, Sagadahoc County, Maine, USA
3.6km (2.2 miles) ⓘTodd's Bay Quarry, Georgetown, Sagadahoc County, Maine, USA
4.0km (2.5 miles) ⓘCummings Quarry, Georgetown, Sagadahoc County, Maine, USA
7.6km (4.7 miles) ⓘSmall Point, Phippsburg, Sagadahoc County, Maine, USA
11.0km (6.8 miles) ⓘDyer Cove, Harpswell, Cumberland County, Maine, USA
19.0km (11.8 miles) ⓘRoute 1 Road Cut, Woolwich, Sagadahoc County, Maine, USA
22.1km (13.8 miles) ⓘStandpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
References
Thompson, W.B., et.al., 1991, Maine Mineral Localities, 2nd edtion, Maine Geological Survey, Augusta.
Cameron, Eugene N.
Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James J., Stewart, Glen W., Shainin, Vincent E. (1954) Pegmatite Investigations, 1942-45, in New England. Geological Survey Professional Paper 255. US Geological Survey doi:10.3133/pp255
 
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