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Zeunerite 2 on quartz Copper urano-arsenate Perry Jones Group Plumas County Calfornia 1969.jpg
Category Arsenate mineral
(repeating unit)
Strunz classification 8.EB.05
Dana classification 40.02a.14.01
Crystal system Tetragonal
Crystal class Ditetragonal dipyramidal (4/mmm)
H-M symbol: (4/m 2/m 2/m)
Space group P4/nnc
Color Yellow-green, emerald-green
Crystal habit Crystals flat tabular on {001}, commonly subparallel to micaceous
Cleavage {001} perfect, {100}, distinct
Mohs scale hardness 2.5
Luster Vitreous
Streak pale green
Diaphaneity Transparent, becoming translucent on dehydration
Specific gravity 3.2 - 3.4
Optical properties Uniaxial (-)
Refractive index nω = 1.610 - 1.613 nε = 1.582 - 1.585
Birefringence δ = 0.028
Pleochroism Visible
Other characteristics Radioactive
References [1][2][3]

Zeunerite is a green copper uranium arsenate mineral with formula Cu(UO2)2(AsO4)2•(10-16)H2O. It is a member of the autunite group. Metazeunerite is a dehydration product.

It occurs as a secondary mineral in the oxidized weathering zone of hydrothermal uranium ore deposits which contain arsenic. Olivenite, mansfieldite, scorodite, azurite and malachite are found in association with zeunerite.[1]

It was first described in 1872 for an occurrence in the Schneeberg District, Erzgebirge, Saxony, Germany. It was named for Gustav Anton Zeuner (1828–1907).[2]