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Anorthite from
Black Mountain, Sierrita Mts, San Xavier (Tohono O'odom) Indian Reservation, Pima Co., Arizona, USA

Locality type:Mountain
Comments:Plagioclase in the andesine-labradorite range. Phenocrysts to 2 inches in intrusive & flow porphyritic rocks, locally termed 'Turkey Track' porphyry.
Validity:Believed Valid
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.
Mineral Data:Click here to view Anorthite data
Locality Data:Click here to view Black Mountain, Sierrita Mts, San Xavier (Tohono O'odom) Indian Reservation, Pima Co., Arizona, USA
Nearest other occurrences of Anorthite
59.1km (36.7 miles) Mineta Ridge area, Rincon Mts, Pima Co., Arizona, USA
80.1km (49.7 miles) Mowry Mine (Patagonia Mine; Enterprise Mine; Phoenix Mine), Mowry Hill, Mowry Wash, Mowry, Patagonia Mining District, Patagonia Mts, Santa Cruz Co., Arizona, USA
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