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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Birnessite from
Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA


Locality type:Mine
Classification
Species:Birnessite
Formula:(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Birnessite data
Locality Data:Click here to view Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:249598
Long-form Identifier:1:3:249598:9
GUID (UUID V4):0
References
Rocks & Minerals (Sept/Oct 1981).
 
and/or  
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