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
Pea Ridge Mine, Washington County, Missouri, 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 Pea Ridge Mine, Washington County, Missouri, USA
Data Identifiers
Mindat Occurrence Record ID:209609
Long-form Identifier:1:3:209609:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
17.8km (11.0 miles) ⓘBourbon Deposit (Bourbon Prospect), Crawford County, Missouri, USA
26.2km (16.3 miles) ⓘKratz Spring, Franklin County, Missouri, USA
44.1km (27.4 miles) ⓘCamels Hump (Czar Knob), Crawford County, Missouri, USA
60.1km (37.3 miles) ⓘSheahan Quarry, Graniteville, Iron County, Missouri, USA
67.4km (41.9 miles) ⓘPilot Knob Mine, Pilot Knob, Iron County, Missouri, USA
70.3km (43.7 miles) ⓘGreasy Mine, St. Francois County, Missouri, USA
80.5km (50.0 miles) ⓘSilver Mine, Fredericktown Mining District, Madison County, Missouri, USA
88.4km (54.9 miles) ⓘWesley chapel, Madison County, Missouri, USA
References
Sherwood, Mark D., Williams, Glenn A. (1998) Missouri Mineral Locality Index. Rocks & Minerals, 73 (2) 98-117 doi:10.1080/00357529809603046
 
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