Formula: NaPbCu5(AsO4)4Cl.5H2O
Origin of name: For Dr. Johan Zdenek (1935-), mineralogist and Director of Scientific Affairs of the Bureau de Recherches Geologiques et Minieres, France.
Crystal system: Tetragonal
Crystal class: 422
Twinning:
Unit cell: a = 10.066, c = 39.39
Colour: Turquoise blue
Diaphaneity: Translucent
Luster: Vitreous
Habit: Tabular crystals to 0.1 mm forming blue crusts and spherulites and aggregates to 0.3 mm
Hardness: 1.5-2
Specific gravity: 4.1
Cleavage: 1; {001} perfect
Tenacity:
Streak: Pale blue
Synonyms/varieties:
Comments: Post-mining origin in walls of Cap Caronne mine, France
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