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Franciscanite
Type Locality
Pennsylvania Mine, San Antonio Valley, Mount Hamilton, Black Wonder District, Diablo Range, Santa Clara Co., California, USA
Mineral Data
Mn
2+
6
(V
5+
,☐)
2
(SiO
4
)
2
(O,OH)
6
Strunz:
9.AF.75
Physical Properties
Hardness:
4.0
