Arsenuranospathite (IMA symbol: Aush) is a rare mineral with the chemical formula Al(UO<sub>2</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>F÷20H<sub>2</sub>O. The name "arsenuranospathite" as arsenate analog of uranospathite was first used by Walenta (1963) with reference to a uranyl-arsenate mineral from Black Forest (Schwarzwald) massif, Germany.
Later it was undoubtedly demonstrated that the name arsenuranospathite was applied, at least, to two different species â proper arsenuranospathite, ideally Al(UO<sub>2</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>F÷20H<sub>2</sub>O, orthorhombic, and its partially dehydrated analogue, Al(UO<sub>2</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>F÷nH<sub>2</sub>O (n = 8âÂÂ10), tetragonal or pseudo-tetragonal.
Yellow to yellow-greenish, transparent to opaque tabular and prismatic crystals, with perfect cleavage. Transparent to translucent. Hardness = ~2. Radioactive.
Contents of Al and U are very stable (1ñ0.05 and 2ñ0.07 atoms per As+P+U = 4 apfu respectively). Main variations of chemical compositions are connected with the ratio As:P and the content of F.
Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany