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
East Fryeburg Quartz locality, Fryeburg, Oxford County, Maine, USA


Locality type:Occurrence
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 East Fryeburg Quartz locality, Fryeburg, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:33619
Long-form Identifier:1:3:33619:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
7.5km (4.7 miles) ⓘJockey Cap Hill Garnet locality, Fryeburg, Oxford County, Maine, USA
8.8km (5.4 miles) ⓘSwan's Falls locality, Fryeburg, Oxford County, Maine, USA
17.2km (10.7 miles) ⓘBurnell Hill Feldspar Quarries, Waterford, Oxford County, Maine, USA
17.4km (10.8 miles) ⓘOrman McAllister Quarry, Lovell, Oxford County, Maine, USA
17.9km (11.1 miles) ⓘRedstone "Red Granite" quarry, Redstone, Conway, Carroll County, New Hampshire, USA
18.0km (11.2 miles) ⓘRedstone "Green Granite" quarry, Redstone, Conway, Carroll County, New Hampshire, USA
18.2km (11.3 miles) ⓘSouth Waterford Mica prospect (Bear Mountain Prospect), Waterford, Oxford County, Maine, USA
18.5km (11.5 miles) ⓘBeech Hill Mica Quarry, Waterford, Oxford County, Maine, USA
19.5km (12.1 miles) ⓘSaunders Mica Quarry, Waterford, Oxford County, Maine, USA
20.5km (12.7 miles) ⓘPine Hill Chrysoberyl locality, Lovell, Oxford County, Maine, USA
References
 
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