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Formula: (NH4 )5(UO2)4(SO4)4(VO5).4H2O
Uranyl sulphate-vanadate
Crystal System: Tetragonal
Specific gravity: 3.672 calculated
Hardness: 2½
Streak: Pale yellow
Colour: Pale yellow to greenish yellow
Luminescence: Fluoresces bright yellow–green under a 405 nm laser
Environments
Sedimentary environments
Hydrothermal environments
Ammoniomathesiusite is a relatively new mineral, approved in 2017.
Localities
At the type locality, the Burro Mine, Slick Rock Mining District, San Miguel County, Colorado, USA,
ammoniomathesiusite occurs as a secondary phase on
asphaltum (bitumen)/quartz matrix in association with
ammoniozippeite, gypsum,
jarosite and natrozippeite.
The mineral forms pale yellow to greenish-yellow transparent prisms with a vitreous lustre, up to ~0.3 mm long
(MM 83.1.115-121).
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