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Anorthite from
Twin Buttes quadrangle, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USA

Locality type:Quadrangle
Classification
Species:Anorthite
Formula:Ca(Al2Si2O8)
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
References
References:Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 329-330; 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.
Data
Mineral Data:Click here to view Anorthite data
Locality Data:Click here to view Twin Buttes quadrangle, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USA
 
Mineral and/or Locality  
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