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Formula: [(V5+O2 )Al7.5(OH)15(H2O)13]2[H2 V4+V5+9O28][V5+10O28]2.90H2O
Decavanadate
Crystal System: Monoclinic
Specific gravity: 2.151 calculated
Hardness: 2 to 3
Streak: Pale yellow
Colour: Yellow
Environments
Sedimentary environments
Hydrothermal environments
Caseyite is a new mineral, approved in 2019 and to date (November 2022) reported only from the type
localities.
Localities
There are three co-type Localities, the Packrat mine, Gateway, Mesa county, the Burro mine, Slick Rock Mining District,
San Miguel county, and the West Sunday mine, Slick Rock Mining District, San Miguel county, all in Colorado, USA.
Caseyite is a secondary mineral formed by oxidation in
a moist, low-temperature, post-mining environment from
montroseite-corvusite and/or
asphaltum (bitumen) assemblages on sandstone in a
uranium/vanadium deposit. Associated minerals include
gypsum and baryte (West Sunday mine),
huemulite (Packrat mine), and
postite (Burro mine), as well as
montroseite and corvusite
(HOM).
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