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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Görgeyite from
Anna mine, Alsdorf, Aachen, Cologne, North Rhine-Westphalia, Germany


Locality type:Colliery
Classification
Species:Görgeyite
Formula:K2Ca5(SO4)6 · H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Görgeyite data
Locality Data:Click here to view Anna mine, Alsdorf, Aachen, Cologne, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:679984
Long-form Identifier:1:3:679984:7
GUID (UUID V4):0
References
Witzke, T., de Wit, F., Kolitsch, U., Blaß, G. (2015) Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. In Coal and Peat Fires: A Global Perspective- Case Studies – Coal Fires Vol. 3. Elsevier. p.203-240. doi:10.1016/C2010-0-68844-4
 
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