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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Rectorite from
Angleing Pinnacle Workings, Paron, Saline County, Arkansas, USA


Locality type:Workings
Classification
Species:Rectorite
Formula:(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Rectorite data
Locality Data:Click here to view Angleing Pinnacle Workings, Paron, Saline County, Arkansas, USA
Data Identifiers
Mindat Occurrence Record ID:48703
Long-form Identifier:1:3:48703:2
GUID (UUID V4):0
References
Rocks & Minerals (1988): 63: 122.
 
and/or  
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