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Formula: Al(UO2)(SO4)2F.16H2O
Valence: Al(U6+O2)(SVO4)2F.16H2O
Hydrated uranyl sulphate,
vanadium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.20 measured, 2.173 calculated
Hardness: 1½
Streak: Nearly white
Colour: Light yellow-green
Luminescence: Bright greenish-blue fluorescence with 405 nm excitation
Solubility: Easily soluble in water at room-temperature
RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Strassmannite occurs as a secondary phase on
asphaltum (bitumen) found in efflorescent crusts on the surfaces of mine walls
(HOM).
Localities
There are two co-type localities, Green Lizard Mine and Markey Mine, both in the Red Canyon Mining District, San
Juan County, Utah, USA.
At the Red Canyon Mining District, San Juan County, Utah, USA,
magnesioleydetite and strassmannite have been found.
Magnesioleydetite occurs in the Markey mine and
strassmannite occurs both in the Markey Mine and in the Green Lizard Mine. Both minerals are
secondary phases found in efflorescent crusts on the
surfaces of mine walls.
Strassmannite occurs in irregular aggregates (up to ~0.5 mm in size) of equant crystals (up to ~0.2 mm)
that are transparent, light yellow–green in colour with a vitreous to greasy lustre and a nearly white streak
(MM 83.3.349-360).
Associated minerals include magnesioleydetite,
arsenuranospathite,
gypsum, metakahlerite,
nováčekite and uramarsite
at Markey Mine, and gypsum,
halotrichite, rozenite and
a Mg analogue of rietveldite at Green Lizard Mine
(HOM).
Strassmannite from Green Lizard Mine -
Image
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