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
Big Mine, Alstead, Cheshire County, New Hampshire, USA


Locality type:Mine
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 Big Mine, Alstead, Cheshire County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:50879
Long-form Identifier:1:3:50879:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.2km (0.7 miles) ⓘBurroughs beryl prospect, Alstead, Cheshire County, New Hampshire, USA
1.3km (0.8 miles) ⓘBlister Mine, Alstead, Cheshire County, New Hampshire, USA
1.3km (0.8 miles) ⓘIsland Mine, Alstead, Cheshire County, New Hampshire, USA
1.4km (0.9 miles) ⓘBritton Quarry, Alstead, Cheshire County, New Hampshire, USA
1.5km (0.9 miles) ⓘFrench Mine, Alstead, Cheshire County, New Hampshire, USA
1.9km (1.2 miles) ⓘBeauregard Mine, Alstead, Cheshire County, New Hampshire, USA
2.4km (1.5 miles) ⓘNichols Quarry, Gilsum, Cheshire County, New Hampshire, USA
3.7km (2.3 miles) ⓘKirk No. 2 Quarry, Gilsum, Cheshire County, New Hampshire, USA
6.5km (4.0 miles) ⓘFitzgibbons Mine, Alstead, Cheshire County, New Hampshire, USA
7.1km (4.4 miles) ⓘGeorge Porter Quarry, 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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