Majuba Hill Mine, Antelope Mining District, Pershing County, Nevada
Miniature - 5.6 x 4.3 x 3.1 cm
71 grams
Mildly radioactive
Specimen status: Reserved
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Opaque, micaceous (meta)zeunerite
crystals to about 4 mm moderately abundant on matrix.
Zeunerite - Cu(UO2 ) 2 (AsO 4 ) 2 ·12H 2 O
readily loses four molecules of water to the atmosphere to
form zeunerite - Cu(UO2 ) 2 (AsO 4 ) 2 ·8H 2 O.
These copper uranyl arsenate hydrates cannot be
distinguished visually, so in the absence of chemical
analysis we cannot know if this is zeunerite or
metazeunerite. Mildly radioactive due to its uranium
content.
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