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
Gambo Falls Staurolite locality, Gorham, Cumberland County, Maine, USA


Locality type:Deposit
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 Gambo Falls Staurolite locality, Gorham, Cumberland County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:36746
Long-form Identifier:1:3:36746:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.6km (1.6 miles) ⓘMallison Falls, Windham, Cumberland County, Maine, USA
3.0km (1.9 miles) ⓘCook Road Staurolite locality, Windham, Cumberland County, Maine, USA
3.7km (2.3 miles) ⓘDundee Falls Kyanite locality, Gorham, Cumberland County, Maine, USA
27.1km (16.9 miles) ⓘTryon Mountain Quarries, Pownal, Cumberland County, Maine, USA
28.5km (17.7 miles) ⓘHeath Quarry, Casco, Cumberland County, Maine, USA
29.4km (18.3 miles) ⓘPorter Landing prospects, Freeport, Cumberland County, Maine, USA
35.4km (22.0 miles) ⓘSymmes Pond Syenite, Straw Hill occurrence, Newfield, York County, Maine, USA
35.5km (22.1 miles) ⓘLaChance Quarry, Brunswick, Cumberland County, Maine, USA
37.9km (23.6 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
39.5km (24.5 miles) ⓘTurner Quarries, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
References
 
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