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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Ettringite from
Zwischenbrücken, Slag localities, Steyr, Upper Austria, Austria


Classification
Species:Ettringite
Formula:Ca6Al2(SO4)3(OH)12 · 26H2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Ettringite data
Locality Data:Click here to view Zwischenbrücken, Slag localities, Steyr, Upper Austria, Austria
Data Identifiers
Mindat Occurrence Record ID:974288
Long-form Identifier:1:3:974288:8
GUID (UUID V4):0
References
Neschen, Peter (n.d.) Personal communication.
 
and/or  
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