Zeunerite
(repeating unit)Cu(UO2)2(AsO4)2·(10-16)H2O IMA symbol Zeu[1] 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 Identification 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 [2][3][4]
H-M symbol: (4/m 2/m 2/m)
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. The associated mineral metazeunerite is a dehydration product of zeunerite.
Zeunerite 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.[2]
It was first described in 1872 for an occurrence in the Schneeberg District, Ore Mountains, Saxony, Germany. It was named for Gustav Anton Zeuner (1828–1907).[3]
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