Arsenuranospathite

Arsenuranospathite (IMA symbol: Aush[1]) is a rare mineral with the chemical formula Al(UO2)2(AsO4)2F·20H2O.

[2] The name "arsenuranospathite" as arsenate analog of uranospathite[3] was first used by Walenta (1963)[4] 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 – proper arsenuranospathite, ideally Al(UO2)2(AsO4)2F·20H2O, orthorhombic, and its partially dehydrated analogue, Al(UO2)2(AsO4)2F·nH2O (n = 8–10), tetragonal or pseudo-tetragonal.

Yellow to yellow-greenish, transparent to opaque tabular and prismatic crystals, with perfect cleavage.

Main variations of chemical compositions are connected with the ratio As:P and the content of F.[citation needed] Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany[3]