Formula: Ba(UO2)2(PO4)2.10H2O
Hydrated normal phosphate, barium and uranium mineral, autunite group.
Epitaxial minerals torbernite and autunite
Specific gravity: 3.46
Hardness: 2 to 2½
Streak: Light yellow
Colour: Yellow-green, yellow; pale canary-yellow in transmitted light.
Solubility: Soluble in acids

Hydrothermal environments

Uranocircite is a secondary mineral occurring in quartz veins with other secondary uranium minerals; it dehydrates rapidly to metauranocircite (Webmin, Mindat).

At Wolsendorf, Bavaria, Germany, uranocircite occurs in a fluorite deposit with parsonite (Dana).

At the type locality, the Streuberg Quarry, Bergen, Vogtland, Saxony, Germany, uranocircite occurs as a secondary mineral in quartz veins (Dana).

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