Natrozippeite

natrozippeite

andersonite

uranopilite

johannite

Images

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 - Image

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