The San Francisco mine worked magnesioriebeckitic asbestos during the 1940s.
NB: Often given in the literature as the type locality for povondraite (formerly called "ferridravite"), but that species and its associated minerals came from the Locotal Breccia, a different rock unit a few hundred metres outside the mine.
Mineral List:8 entries listed. 5 valid minerals. 2 erroneous literature entries.
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