Nesosilicate (insular SiO4 groups)
Specific gravity: 4.70
Colour: Lemon yellow to amber yellow
Soddyite is a secondary mineral formed by oxidation of
uraninite. Associated minerals include
uranophane, torbernite and
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).
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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