Английская Википедия:Arsenuranospathite

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Шаблон:Short description Шаблон:Use dmy dates 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.

Файл:Arsenuranospathite, Menzenschwand.jpg
Arsenuranospathite

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.

Properties

Yellow to yellow-greenish, transparent to opaque tabular and prismatic crystals, with perfect cleavage. Transparent to translucent. Hardness = ~2. Radioactive.[3]

Chemical composition

Contents of Al and U are very stable (1±0.05 and 2±0.07 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.

Occurrences

Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany[3]

References

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