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
Square Pit (Consolidated #4 Quarry), Topsham, Sagadahoc County, Maine, USA


Locality type:Pit
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 Square Pit (Consolidated #4 Quarry), Topsham, Sagadahoc County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:29663
Long-form Identifier:1:3:29663:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.1km (0.1 miles) ⓘWilliam Willes #1 Quarry, Topsham, Sagadahoc County, Maine, USA
0.8km (0.5 miles) ⓘFisher Quarry, Topsham, Sagadahoc County, Maine, USA
1.0km (0.6 miles) ⓘTrenton Quarry, Topsham, Sagadahoc County, Maine, USA
1.8km (1.1 miles) ⓘTwin Pits Quarry, Cathance River Nature Preserve, Topsham, Sagadahoc County, Maine, USA
1.9km (1.2 miles) ⓘHavey #1 & #2 Quarries, Topsham, Sagadahoc County, Maine, USA
1.9km (1.2 miles) ⓘSwamp #1 Quarry, Cathance River Nature Preserve, Topsham, Sagadahoc County, Maine, USA
1.9km (1.2 miles) ⓘSwamp #2 quarry, Cathance River Nature Preserve, Topsham, Sagadahoc County, Maine, USA
2.2km (1.3 miles) ⓘConsolidated #2 Quarry (Purington Quarry), Highland Green, Topsham, Sagadahoc County, Maine, USA
2.2km (1.4 miles) ⓘConsolidated #1 Quarry, Highland Green, Topsham, Sagadahoc County, Maine, USA
2.3km (1.4 miles) ⓘLeavitt Prospect, Highland Green, Topsham, Sagadahoc 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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