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
George Porter Quarry, Alstead, Cheshire County, New Hampshire, 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 George Porter Quarry, Alstead, Cheshire County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:50967
Long-form Identifier:1:3:50967:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.9km (1.8 miles) ⓘAllen Quarry, Alstead, Cheshire County, New Hampshire, USA
3.3km (2.1 miles) ⓘColony Quarry, Alstead, Cheshire County, New Hampshire, USA
3.7km (2.3 miles) ⓘYuhas No. 2 Quarry, Acworth, Sullivan County, New Hampshire, USA
3.9km (2.4 miles) ⓘYuhas No. 1 Quarry, Acworth, Sullivan County, New Hampshire, USA
4.6km (2.9 miles) ⓘProvencher Quarry, Alstead, Cheshire County, New Hampshire, USA
4.8km (3.0 miles) ⓘFitzgibbons Mine, Alstead, Cheshire County, New Hampshire, USA
6.0km (3.7 miles) ⓘBritton Quarry, Alstead, Cheshire County, New Hampshire, USA
6.3km (3.9 miles) ⓘBeryl Mountain Quarry, South Acworth, Acworth, Sullivan County, New Hampshire, USA
7.1km (4.4 miles) ⓘBig Mine, Alstead, Cheshire County, New Hampshire, USA
7.9km (4.9 miles) ⓘBurroughs beryl prospect, Alstead, Cheshire County, New Hampshire, USA
References
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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