Images
Formula: Cu(UO2)2(AsO4)2.12H2O
Hydrated normal arsenate,
autunite group, uranyl
mineral
Crystal System: Tetragonal
Specific gravity: 3.47 measured, 3.57 calculated
Hardness: 2½
Streak: Pale green
Colour: Pale to emerald green
RADIOACTIVE
Environments
Zeunerite is an uncommon secondary mineral in the
oxidised zone of arsenic-bearing hydrothermal
uranium deposits (HOM, Mindat, Webmin).
Associated minerals include olivenite,
mansfieldite,
scorodite, azurite and
malachite
(HOM, Mindat).
Localities
The type locality is the Walpurgis Flacher vein, Weißer Hirsch Mine (Shaft 3), Neustädtel, Schneeberg,
Erzgebirgskreis, Saxony, Germany.
Zeunerite from the Walpurgis Flacher vein -
Image
At the Centennial Eureka Mine, Eureka, Tintic Mining District, Juab County, Utah, USA, minute yellowish-green tabular
crystals of zeunerite have been found in some of the baryte in the ore
(MinRec 55.2.232).
Zeeunerite from the Centennial Eureka Mine -
Image
Alteration
At 65oC in air zeunerite transforms to metazeunerite
with 8H2O
(Dana, Webmin, Mindat).
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