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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Labradorite from
Twin Buttes quadrangle, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA


Locality type:Quadrangle
Classification
Species:Anorthite var: Labradorite
Formula:(Ca,Na)[Al(Al,Si)Si2O8]
Comments:Andesine-Labradorite segment of the Albite-Anorthite series. As phenocrysts up to 2 inches long in intrusive & flow porphyritic rocks, locally termed 'turkey track porphyry' in the lower part of the Helmet fanglomerate.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Labradorite data
Locality Data:Click here to view Twin Buttes quadrangle, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:258708
Long-form Identifier:1:3:258708:0
GUID (UUID V4):0
References
Cooper, J.R. (1961), Turkey-track porphyry - A possible guide for correlation of iocene rocks in southeastern AZ, AZ Geol. Soc. Digest: 4: 17-35.
Anthony, John W.; Williams, Sidney A.; Bideaux, Richard A.; Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.pp.329-330
 
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