Formula :
Cu4[(OH)6/SO4] * 2 H2O
System: orthorhombic Hardness:2˝-3 Rarity:rare
Strunz id:7.DD.10 -
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
Name origin: Named for Victor von Lang (1838-1921), physicist and crystallographer, Professor of Physics, University of Vienna, Vienna, Austria.
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