FranciscanitePennsylvania Mine, San Antonio Valley, Mount Hamilton, Black Wonder District, Diablo Range, Santa Clara Co., California, USA
Photo: Knut Eldjarn A Mn mine located on the SW side of the San Antonio Valley, 4 miles ENE of Mount Hamilton.
References
Erd, R.C. and Y. Ohashi (1981) Santaclaraite, a new manganese silicate from California, American Mineralogist:
American Mineralogist (1984): 69: 200-206.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 382-383 (as unnamed abandoned mine), 414.
ref :
http://www.mineralsocal.org/scfm/index.htmlMineral List
19 entries listed. 18 valid minerals. 2 type localities (valid minerals).
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