Images
Formula:
(UO2)3(Se4+O3))2)(OH)2).5H2)O
or
(U6+O2)3(Se4+O3))2)(OH)2).5H2)O
Selenite, uranyl mineral
Crystal System: Orthorhombic
Specific gravity: 4.1 measured, 4.07 calculated
Hardness: 1½ to 2
Colour: Amber-yellow
Luminescence: Yellowish green fluorescence under short wave UV
RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the type locality, the Repete Mine, Montezuma Canyon Mining District, San Juan County, Utah, USA,
secondary haynesite occurs as amber-yellow,
transparent to translucent, millimetric tablets and rosettes; it is associated with
andersonite, boltwoodite,
larisaite, ferroselite,
uraninite, marcasite,
gypsum, baryte and
calcite as crusts on
mudstone and
sandstone of Upper Jurassic age (161 to 145 million years ago)
(CM 29.561-564, HOM, Lauf2).
Haynesite from the Repete mine - Image
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