Formula : Cu6Al[(OH)12/Cl/SO4] * 3 H2O
System: hexagonal Hardness:2 Rarity:rare
Strunz id:VI/D.8-10 -
SULFATES, CHROMATES, MOLYBDATES and TUNGSTATES
Name origin: Named after Norman Spang (1842-1922), of Etna, Allegheny County, Pennsylvania, USA, contributor of the type specimen for study.
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