Formula: Cu2V2O7
Origin of name: for Emanuel G. Zies 1884-1981), American geologist, Geophysical Laboratory, Carnegie Institution, Washington D.C. USA.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 7.689, b = 8.029, c = 10.106, β = 110.25°
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: Anhedral grains to 200µm
Hardness:
Specific gravity: 3.86
Cleavage: None
Tenacity:
Streak: Brown, red brown
Synonyms/varieties:
Comments: Dimorphous with blossite
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