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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Smithsonite from
Bonanza Mine, Old Buffalo, Cedar Creek-Boat Creek-CPW Mining District, Marion County, Arkansas, USA


Locality type:Mine
Classification
Species:Smithsonite
Formula:ZnCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Smithsonite data
Locality Data:Click here to view Bonanza Mine, Old Buffalo, Cedar Creek-Boat Creek-CPW Mining District, Marion County, Arkansas, USA
Data Identifiers
Mindat Occurrence Record ID:49816
Long-form Identifier:1:3:49816:2
GUID (UUID V4):0
References
Rocks & Min.:63:111
Stroud, et al(1969).
 
and/or  
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