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Voltaite

Type Locality
Solfatara di Pozzuoli, Pozzuoli, Phlegrean Fields, Naples Province, Phlegrean Volcanic Complex, Campania, Italy
Mineral Data
K2Fe2+5Fe3+3Al(SO4)12·18H2O
Strunz: 
7.CC.25
Physical Properties
Hardness: 
3.0 - 3.5
Photos