Hydrated normal phosphate, barium-bearing 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
Uranocircite is a secondary mineral occurring in
quartz veins with other secondary
uranium minerals; it dehydrates rapidly to metauranocircite
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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