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Formula: (UO2)2(SiO4).2H2O
Nesosilicate (insular SiO4 groups), uranyl mineral.
Crystal System: Orthorhombic
Specific gravity: 4.63 to 4.70 measured, 5.09 calculated
Hardness: 3½
Colour: Lemon yellow to amber yellow
RADIOACTIVE
Environments
Pegmatites
Sedimentary environments
Hydrothermal environments
Soddyite is a secondary mineral formed by oxidation of
uraninite. Associated minerals include
kasolite, sklodowskite,
uranophane, torbernite and
curite
(HOM).
Localities
At the Number 2 workings on Radium Ridge near Mount Painter, near Arkaroola, Northern Flinders Ranges,
South Australia, soddyite is associated with spriggite
(CM 42.1257).
At the type locality, the Shinkolobwe Mine, Shinkolobwe, Kambove District, Haut-Katanga, DR Congo, soddyite occurs
intimately mixed with curite, and crystals are also found associated with needles
of sklodowskite on curite, the
soddyite seemingly formed after the curite and before the
sklodowskite. Kasolite is another
associated mineral
(AM 37.386-393).
Soddyite from Shinkolobwe - Image
In the Goodhouse-Vioolsdrift area, Orange River, Namakwa, Northern Cape, South Africa, soddyite occurs in
pegmatites, as an incrustation on
quartz, associated with malachite
(AM 37.386-393).
At the Ruggles Mine, Grafton, Grafton county, New Hampshire, USA, soddyite occurs as
pseudomorphs after uraninite
(Dana).
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