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Biotite from
Black Mountain Quarry (Black Mountain pegmatite), Rumford, Oxford County, Maine, USA

Locality type:Quarry
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
References
References:USGS Bull 445
Associated Minerals Based on Photo Data:
Beryl1 photo of Biotite associated with Beryl at this locality.
Almandine1 photo of Biotite associated with Almandine at this locality.
Microcline1 photo of Biotite associated with Microcline at this locality.
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Black Mountain Quarry (Black Mountain pegmatite), Rumford, Oxford County, Maine, USA
Nearest other occurrences of Biotite
7.7km (4.8 miles) Dunton Gem Quarry, Newry, Oxford County, Maine, USA
16.1km (10.0 miles) Lobikis Quarry, Peru, Oxford County, Maine, USA
17.0km (10.5 miles) East Branch Swift River Gold locality, Byron, Oxford County, Maine, USA
20.1km (12.5 miles) Hedgehog Hill Quarry (Gem Mica Quarry), Peru, Oxford County, Maine, USA
26.1km (16.2 miles) Ragged Ass Jack Mountain locality (Ragged Jack Mountain locality), Hartford, Oxford County, Maine, USA
28.2km (17.5 miles) Songo Pond Quarry (Kimball Ledge Quarry), Albany, Oxford County, Maine, USA
29.4km (18.3 miles) Emmons Quarry (Uncle Tom Mountain Quarry), Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
30.7km (19.1 miles) A.C. Perham Quarry, West Paris, Oxford County, Maine, USA
30.8km (19.1 miles) Donahue Quarry (Donahue Prospect), Albany, Oxford County, Maine, USA
32.0km (19.9 miles) Heikkinen Quarry, Greenwood, Oxford County, Maine, USA
 
Mineral and/or Locality  
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