Images
Formula: Mg2(UO2)(CO3)3.18H2O
Hydrated carbonate, uranyl mineral
Crystal System: Monoclinic
Specific gravity: 2.05 measured, 2.06 calculated
Hardness: 2 to 2½
Streak: White
Colour: Yellow, whitish yellow
Luminescence: Weakly fluorescent yellow-green to pale greenish in LW and SW UV.
Solubility: Soluble in water
Very strongly RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Bayleyite occurs as a coating or efflorescence with other
secondary uranium
minerals, which may be post-mining; typically in sediment-hosted
uranium-bearing deposits
(HOM).
Localities
At the type locality, the Hillside Mine, Bozarth Mesa, Bagdad, Eureka Mining District, Yavapai County, Arizona,
USA, bayleyite is associated with schröckingerite,
andersonite, swartzite
and gypsum
(HOM).
At the Hideout Mine, Deer Flat Mining District, San Juan County, Utah, USA, bayleyite is associated with
schröckingerite and
gypsum
(HOM).
Bayleyite from the Hideout mine - Image
At Pumpkin Buttes Mining District, Johnson County, Wyoming, USA, bayleyite is associated with
tyuyamunite, uranophane,
liebigite and carnotite
(HOM).
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