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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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Biotite from
Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA


05578060017272013335674.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
04518360017271979351561.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
09657530017271979426511.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
03870340017272013703537.jpg
Biotite

Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
05578060017272013335674.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
09535340017272013354750.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
03330400017272013393623.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
04705930017373548327281.jpg
Biotite

Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
05578060017272013335674.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
04518360017271979351561.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
09657530017271979426511.jpg
Annite

Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
04472400017272013749012.jpg
Biotite

Standpipe Hill Quarries, Topsham, 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
Associated Minerals Based on Photo Data:
Microcline1
Quartz1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:29705
Long-form Identifier:1:3:29705:9
GUID (UUID V4):0
Localities for Biotite in this Region
Yedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
Nearest other occurrences of Biotite
0.2km (0.1 miles) ⓘYedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
0.4km (0.2 miles) ⓘNorth Russell Brothers Quarry, Topsham, Sagadahoc County, Maine, USA
0.4km (0.2 miles) ⓘRussell Brothers Quarry, Topsham, Sagadahoc County, Maine, USA
2.4km (1.5 miles) ⓘMetcalf Quarry, Mount Ararat Quarries, Topsham, Sagadahoc County, Maine, USA
2.4km (1.5 miles) ⓘMount Ararat Quarries, Topsham, Sagadahoc County, Maine, USA
2.6km (1.6 miles) ⓘPorcupine Hill Quarry, Topsham, Sagadahoc County, Maine, USA
3.4km (2.1 miles) ⓘLeavitt Prospect, Highland Green, Topsham, Sagadahoc County, Maine, USA
3.5km (2.2 miles) ⓘConsolidated #1 Quarry, Highland Green, Topsham, Sagadahoc County, Maine, USA
3.5km (2.2 miles) ⓘConsolidated #2 Quarry (Purington Quarry), Highland Green, Topsham, Sagadahoc County, Maine, USA
3.7km (2.3 miles) ⓘSwamp #2 quarry, Cathance River Nature Preserve, 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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