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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Anorthoclase from
Portland Harbour Trust Quarry, Cape Sir William Grant, Portland, Glenelg Shire, Victoria, Australia


Locality type:Quarry
Classification
Species:Albite var: Anorthoclase
Formula:(Na,K)AlSi3O8
Comments:"One feldspar crystal selected for microprobe analysis from the interlocking mass consisted mainly of anorthoclase, with a rim of andesine. However none of the other crystals examined microscopically show this relationship and it is not possible to establish how widespread anorthoclase really is."
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Anorthoclase data
Locality Data:Click here to view Portland Harbour Trust Quarry, Cape Sir William Grant, Portland, Glenelg Shire, Victoria, Australia
Data Identifiers
Mindat Occurrence Record ID:92083
Long-form Identifier:1:3:92083:8
GUID (UUID V4):0
References
Birch, W.D., Smith, N., Hately, J. (1982): Andesine, Augite and Ilmenite in vesicles in an alkali olivine basalt from Portland, Victoria. The Australian Mineralogist 37, 195-198.
Birch, W. D. - Ed. (1989) Zeolites of Victoria. Special Publication No.2. Mineralogical Society of Victoriapp.86-89
 
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