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
Emmons Quarry, Uncle Tom Mountain, 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 Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28533
Long-form Identifier:1:3:28533:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.9km (0.6 miles) ⓘTiger Bill Quarries, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
4.7km (2.9 miles) ⓘPatch Mountain Beryl prospect, Greenwood, Oxford County, Maine, USA
5.1km (3.1 miles) ⓘStearns Quarry, Albany, Oxford County, Maine, USA
5.6km (3.5 miles) ⓘNoyes Mountain Quarry (Harvard Quarry), Greenwood, Oxford County, Maine, USA
5.6km (3.5 miles) ⓘMorgan Quarry (Morgan Pit; Upper Noyes Mountain Quarry; Upper Harvard Quarry), Greenwood, Oxford County, Maine, USA
5.7km (3.6 miles) ⓘHeikkinen Quarry, Greenwood, Oxford County, Maine, USA
6.2km (3.9 miles) ⓘTamminen Quarry, Greenwood, Oxford County, Maine, USA
6.2km (3.9 miles) ⓘOhtonen Quarry, Greenwood, Oxford County, Maine, USA
6.3km (3.9 miles) ⓘWaisanen Quarry (Tamminen-Waisanen Quarry), Greenwood, Oxford County, Maine, USA
6.4km (4.0 miles) ⓘWitt Hill Chrysoberyl locality, 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
Falster, Alexander U., Simmons, William B., Webber, Karen L., Dallaire, Donald A., Nizamoff, James W., Sprague, Raymond A. (2019) The Emmons Pegmatite, Greenwood, Oxford County, Maine. Rocks & Minerals, 94 (6) 498-519 doi:10.1080/00357529.2019.1641021
 
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