Formula :
Cu9[(OH)10/SO4/(AsO4)2] * 7 H2O
System: orthorhombic Hardness:2 Rarity:rare
Strunz id:VII/D.20-30 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: After John L. Parnau (1906-1990), American mineral collector, of Campbell, California, USA, who made contributions to knowledge of the type locality.
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