Formula : Cu19[Cl4/(OH)32/(NO3)2] * 2 H2O
System: hexagonal Hardness:3 Rarity:very rare
Strunz id:III/D.3-30 -
HALOGENIDES
Name origin: Named in 1925 by A. Schoep for Henri Buttgenbach (Verviers, Liège province, Belgium February 5, 1874 - Sint-Pieters-Woluwe, Brussels, April 29, 1964), a Belgian mineralogist.
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