a yellow mineral, a hydrous calcium uranium phosphate, CaU 2 P 2 O 12 ⋅8H 2 O, occurring in crystals as nearly square tablets: a minor ore of uranium.
Historical Examples

autunite, a hydrous phosphate of uranium and calcium, crystallizing in the rhombic system in yellow plates.
The New Gresham Encyclopedia. Vol. 1 Part 3 Various

a yellowish fluorescent radioactive mineral consisting of a hydrated calcium uranium phosphate in tetragonal crystalline form. It is found in uranium ores. Formula: Ca(UO2)2(PO4)2.10–12H2O


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