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Formula: [(UO2)2(C2O42(H2O)2 ].H2O
Uranyl oxalate
Specific gravity: 4.187 calculated
Hardness: 2
Streak: Very pale yellow
Colour: Light yellow
Luminescence: Moderate neon-green fluorescence under UV
Solubility: At room-temperature, insoluble in water and slowly soluble in dilute hydrochloric acid
Environments
Uroxite is a new mineral, approved in 2018 and to date (November 2022) reported only from the type localities.
Localities
There are two co-type Localities, the Burro Mine, Slick Rock Mining District, San Miguel county, Colorado, USA, and
the Markey Mine, Red Canyon Mining District, San Juan County, Utah, USA. Uroxite and
metauroxite are the first two uranyl oxalate minerals found.
Uroxite is a post-mining secondary phase found in
efflorescent crusts on mine walls as light yellow striated blades or prisms
(MM 84.1.131-141).
The crystals are up to about 1 mm long, with square to rectangular cross-sections and steeply sloping terminations,
typically in radiating sprays. Associated minerals include quartz,
gypsum, feynmanite, bitumen and
abernathyite
(Mindat).
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