Formula :
NaPbCu5[Cl/(AsO4)4] * 5 H2O
System: tetragonal Hardness:1½ - 2 Rarity:extremely rare
Strunz id:VII/D.25-25 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: Named by P.-J. Chiappero and H. Sarp in 1995 in honor of Dr. Zdenĕk Johan (18 November 1935, Lomnice nad Popelkou, Czech Republic - 13 February 2016, Orléans, France), mineralogist and Director of Scientific Affairs of the Bureau de Recherches Géologiques et Minières, France. Vice president of the International Mineralogical Association 1996-1998. The mineral is based on his given name rather than family name because the mineral johannite was already named.
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