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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Opal-AN from
Farm Eichner, St. Ulrich bei Steyr, Steyr-Land District, Upper Austria, Austria


02263490017367137239939.jpg
Opal-AN

Farm Eichner, St. Ulrich bei Steyr, Steyr-Land District, Upper Austria, Austria
02263490017367137239939.jpg
Opal-AN

Farm Eichner, St. Ulrich bei Steyr, Steyr-Land District, Upper Austria, Austria
07826350017272084621743.jpg
Opal-AN

Farm Eichner, St. Ulrich bei Steyr, Steyr-Land District, Upper Austria, Austria
Classification
Species:Opal var: Opal-AN
Formula:SiO2 · nH2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Opal-AN data
Locality Data:Click here to view Farm Eichner, St. Ulrich bei Steyr, Steyr-Land District, Upper Austria, Austria
Data Identifiers
Mindat Occurrence Record ID:773167
Long-form Identifier:1:3:773167:9
GUID (UUID V4):0
References
Neschen, Peter (n.d.) Personal communication.
 
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