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
Beryl mine, Tigerton, Shawano County, Wisconsin, USA


Locality type:Mine
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 Beryl mine, Tigerton, Shawano County, Wisconsin, USA
Data Identifiers
Mindat Occurrence Record ID:128376
Long-form Identifier:1:3:128376:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
8.2km (5.1 miles) ⓘTigerton anorthosite outcrops, Tigerton, Shawano County, Wisconsin, USA
10.2km (6.4 miles) ⓘKeller Lake pegmatite, Waupaca County, Wisconsin, USA
14.2km (8.9 miles) ⓘDupont uranium claims, Waupaca County, Wisconsin, USA
35.6km (22.1 miles) ⓘWaupaca granite quarry, Waupaca County, Wisconsin, USA
51.9km (32.2 miles) ⓘStevens Point, Portage County, Wisconsin, USA
57.0km (35.4 miles) ⓘBeilke Quarry, Nine Mile Pluton, Wausau Intrusive Complex, Marathon County, Wisconsin, USA
60.4km (37.5 miles) ⓘKoss pit, Nine Mile Pluton, Wausau Intrusive Complex, Marathon County, Wisconsin, USA
62.2km (38.6 miles) ⓘCounty road U road cut, Stettin pluton, Wausau Intrusive Complex, Marathon County, Wisconsin, USA
62.7km (39.0 miles) ⓘKempster, Langlade County, Wisconsin, USA
65.3km (40.6 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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