Autunite
Chemical compound
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Autunite, with formula Ca(UO₂)₂(PO₄)₂·10–12H₂O, is a yellow-greenish fluorescent phosphate mineral with a hardness of 2–2+1⁄2. Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals, commonly in small crusts... Wikipedia
Formula mass: 986.26 g/mol
Ultraviolet fluorescence: Strong yellow-green fluorescence in UV; Radioactive
Density: 3.15
Solubility: Soluble in acids
Cleavage: perfect,, and, poor
Color: Lemon-yellow to sulfur-yellow, greenish yellow to pale green; may be dark green to greenish black
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)