Arsenuranospathite

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Arsenuranospathite is a rare mineral with the chemical formula Al(UO2)2(AsO4)2F·20H2O.[1] The name "arsenuranospathite" as arsenate analog of uranospathite[2] was first used by Walenta (1963)[3] 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.

Properties[edit]

Yellow to yellow-greenish, transparent to opaque tabular and prismatic crystals, with perfect cleavage. Transparent to translucent. Hardness = ∼2. Radioactive.[4]

Chemical composition[edit]

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[edit]

Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany[2]

See also[edit]

  • Chistyakovaite

References[edit]

  1. ^ Chukanov et al.,, N.V. "Arsenuranospathite, Al(UO2)2(ASO) 2F·20OH2O: Formula revision and relationships with allied uranyl arsenates and phosphates".CS1 maint: extra punctuation (link)
  2. ^ a b "handbookofmineralogy".
  3. ^ "Uranospathite and arsenuranospathite".
  4. ^ http://www.handbookofmineralogy.org/pdfs/arsenuranospathite