Formula :
Cu4[(OH)6/SO4] * H2O
System: monoclinic Hardness:2-3 Rarity:rare
Strunz id:VI/D.3-10 -
SULFATES, CHROMATES, MOLYBDATES and TUNGSTATES
Name origin: Named in 1967 by A. I. Komkov and E. I. Nefedov in honour of Eugene Waldemar Posnjak (23 June 1888, Moscow, Russia - 31 July 1949, Santa Barbara, California), U.S. geochemist at the Geophysical Laboratory, Washington, U.S.A., who investigated the system CuO-SO3-H2O.
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