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
Tigerton anorthosite outcrops, Tigerton, Shawano County, Wisconsin, USA


Locality type:Outcrop
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 Tigerton anorthosite outcrops, Tigerton, Shawano County, Wisconsin, USA
Data Identifiers
Mindat Occurrence Record ID:243121
Long-form Identifier:1:3:243121:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
8.2km (5.1 miles) ⓘBeryl mine, Tigerton, Shawano County, Wisconsin, USA
18.3km (11.4 miles) ⓘKeller Lake pegmatite, Waupaca County, Wisconsin, USA
22.3km (13.9 miles) ⓘDupont uranium claims, Waupaca County, Wisconsin, USA
43.6km (27.1 miles) ⓘWaupaca granite quarry, Waupaca County, Wisconsin, USA
54.1km (33.6 miles) ⓘBeilke Quarry, Nine Mile Pluton, Wausau Intrusive Complex, Marathon County, Wisconsin, USA
54.5km (33.9 miles) ⓘKempster, Langlade County, Wisconsin, USA
55.9km (34.8 miles) ⓘStevens Point, Portage County, Wisconsin, USA
58.1km (36.1 miles) ⓘCounty road U road cut, Stettin pluton, Wausau Intrusive Complex, Marathon County, Wisconsin, USA
58.2km (36.2 miles) ⓘKoss pit, Nine Mile Pluton, Wausau Intrusive Complex, Marathon County, Wisconsin, USA
59.9km (37.2 miles) ⓘRuby Red Quarry (Anderson Brothers & Johnson Company), Maine, Marathon County, Wisconsin, USA
References
Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
 
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