Chemistry: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.
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
- ↑ Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ Chukanov, N.V.. "Arsenuranospathite, Al(UO2)2(ASO) 2F·20OH2O: Formula revision and relationships with allied uranyl arsenates and phosphates". https://www.researchgate.net/publication/233687815.
- ↑ 3.0 3.1 3.2 "Arsenuranospathite". Handbook of Mineralogy. http://www.handbookofmineralogy.org/pdfs/arsenuranospathite.
- ↑ Walenta, Kurt (1978). "Uranospathite and arsenuranospathite". Mineralogical Magazine 42 (321): 117–128. doi:10.1180/minmag.1978.042.321.18. Bibcode: 1978MinM...42..117W.
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