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
Noyes Mountain Quarry (Harvard Quarry), Greenwood, Oxford 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 Noyes Mountain Quarry (Harvard Quarry), Greenwood, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28950
Long-form Identifier:1:3:28950:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.1km (0.0 miles) ⓘMorgan Quarry (Morgan Pit; Upper Noyes Mountain Quarry; Upper Harvard Quarry), Greenwood, Oxford County, Maine, USA
0.8km (0.5 miles) ⓘWaisanen Quarry (Tamminen-Waisanen Quarry), Greenwood, Oxford County, Maine, USA
0.8km (0.5 miles) ⓘTamminen Quarry, Greenwood, Oxford County, Maine, USA
1.0km (0.6 miles) ⓘWitt Hill Chrysoberyl locality, Greenwood, Oxford County, Maine, USA
1.1km (0.7 miles) ⓘHeikkinen Quarry, Greenwood, Oxford County, Maine, USA
1.5km (0.9 miles) ⓘNubble Quarry, Greenwood, Oxford County, Maine, USA
1.6km (1.0 miles) ⓘPatch Mountain Beryl prospect, Greenwood, Oxford County, Maine, USA
3.2km (2.0 miles) ⓘOhtonen Quarry, Greenwood, Oxford County, Maine, USA
3.3km (2.1 miles) ⓘDunn Quarry, Norway, Oxford County, Maine, USA
5.6km (3.5 miles) ⓘEmmons Quarry, Uncle Tom Mountain, Greenwood, Oxford 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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