Formula : Cu9Al[(OH)12/(SO4)1.5/(AsO4)2]3 * 18 H2O
System: trigonal Hardness:2 Rarity:rare
Strunz id:VII/D.20-50 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: From the Greek in allusion to the composition, containing copper, and the micaceous structure.
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