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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Columbite-(Mn) from
Waterloo quarry (Michels Materials Waterloo quarry; Portland Quarry), Dodge County, Wisconsin, USA


Locality type:Quarry
Classification
Species:Columbite-(Mn)
Formula:Mn2+Nb2O6
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Columbite-(Mn) data
Locality Data:Click here to view Waterloo quarry (Michels Materials Waterloo quarry; Portland Quarry), Dodge County, Wisconsin, USA
Data Identifiers
Mindat Occurrence Record ID:459403
Long-form Identifier:1:3:459403:1
GUID (UUID V4):0
References
Buchholz, T., A. Falster, A. & W. Simmons (2003) The Waterloo quarry: a new location for gahnite, manganocolumbite and tantalite in southern Wisconsin: Rocks and Minerals78, (2): 118.
Buchholz, Thomas W., Falster, Alexander U. and Simmons, Wm. B. (2016) Pegmatite Mineralogy of the Waterloo Quarry, Southern Wisconsin, USA. in Second Eugene E. Foord Pegmatite Symposium July 15-19, 2016 Colorado School of Mines campus, Golden, Colorado
 
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