A bright yellow-green mineral typically occurring as thin, tabular crystals.
Uranocircite is a hydrated barium uranyl phosphate, Ba(UO₂)₂(PO₄)₂·12H₂O. Crystal system: tetragonal.
Late 19th century; earliest use found in American Journal of Science. From urano- + ancient Greek κίρκος falcon (perhaps of imitative origin, or perhaps a transferred use of κίρκος circle, so called on account of the circling motion of the sparrowhawk) + -ite, after German Uranocircit, so called with punning reference to the place where it was discovered, Falkenstein, in Germany.