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Formula: (NH4)2Mg(UO2)2(SO4)4(H2O)8
Valence: (N3-H4)2Mg(U6+O2)2(S6+O4)4(H2O)8
Sulphate, uranyl mineral,
svornostite subgroup,
svornostite group
Crystal system: Orthorhombic
Specific gravity: 3.06 measured, 3.097 calculated
Hardness: 2½
Streak: Very pale yellow
Colour: Yellow
Solubility: Soluble in water
RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Svornostite-(NH4) is a new mineral, approved in 2024.
Localities
At the type locality, the Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA,
svornostite-(NH4) occurs as sprays and subparallel groups of yellow blades in a
secondary assemblage with
ammoniozippeite, blödite,
boussingaultite, gypsum,
hexahydrite, kröhnkite,
plášilite and quartz. The streak is
very pale yellow. Crystals are transparent with a vitreous lustre.
Svornostite-(NH4) is formed by hydration-oxidation weathering of
primary uranium minerals,
mainly uraninite, by acidic solutions derived from the decomposition of
associated sulphides
(MM 89.5.609-617).
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