Formula: Cu (UO2)2 (AsO4)2 .10-16H2O
Origin of name: for Gustav Anton Zeuner (1828-1907), Director of the School of Mines, Freiberg, Germany
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 7.18, c = 21.06
Colour: Yellowish green, green to emerald-green
Diaphaneity: Translucent to transparent
Luster: Vitreous (weakly)
Habit: Crystals tabular, resemble Torbernite
Hardness: 2.5
Specific gravity: 3.39
Cleavage: 2; {001}perfect, {100} distinct
Tenacity: Uneven fracture
Streak: Pale green
Synonyms/varieties:
Comments: Transparent when completely hydrated, radioactive
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