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Formula: Na5(UO2)8(SO4)4O5(OH)3.12H2O
Hydrated sulphate containing hydroxyl, zippeite group
Crystal System: Monoclinic
Specific gravity: 4.517 calculated
Hardness: 5 to 5½
Streak: Yellow
Colour: Yellow to greenish yellow or yellowish green
Luminescence: Bright yellow fluorescence in both short wave and long wave UV
RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Natrozippeite is a secondary alteration product of
uraninite and
base-metal sulphides in the oxidised zone of uranium-rich deposits, typically in
sandstone-type uranium deposits. It is also of post-mine origin,
where the sodium may be supplied by percolating saline water. Associated minerals include
andersonite, uranopilite,
johannite, schröckingerite
and other zippeite-group minerals
(HOM).
Localities
At the type locality, the Happy Jack mine, White Canyon Mining District, San Juan County, Utah, USA,
natrozippeite occurs as velvety crusts of minute yellow masses and rare crystals
(Mindat).
Natrozippeite from the Happy Jack mine -
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