Arsenuranospathite, Al(UO₂)₂(AsO₄)₂F·20H₂O: Formula revision and relationships with allied uranyl arsenates and phosphates

Authors: Chukanov, N.V.; Möckel, S.; Sidorenko, G.A.; Zaitsev, V.A.

Source: Neues Jahrbuch für Mineralogie - Abhandlungen, Volume 185, Number 3, April 2009 , pp. 305-312(8)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

A representative collection of specimens with arsenuranospathite and related minerals (including low-hydrated and F-deficient analogues of arsenuranospathite, as well as their PO₄-dominant counterparts) from the type locality of arsenuranospathite (Menzenschwand, Schwarzwald, Germany) has been investigated using electron-microprobe analysis, TG, X-ray powder diffraction and IR spectroscopy. The results obtained, together with related data from literature sources, undoubtedly demonstrate that the name arsenuranospathite is applied, at least, to two different species: proper arsenuranospathite (As-dominant mineral, closely related to of uranospathite, idealized formula Al(UO₂)₂(AsO₄)₂F·20H₂O, orthorhombic, a = 30.070 Å, b = 7.147 Å, c = 7.193 Å; V = 1545.8 Å³, Z = 2), and its partially dehydrated counterpart, Al(UO₂)₂(AsO₄)₂F·nH₂O (n = 8-10), tetragonal or pseudo-tetragonal, a = 7.246 Å, c = 20.79 Å; V = 1091.6 Å³, Z = 2.

Keywords: ARSENURANOSPATHITE; CHEMICAL COMPOSITION; X-RAY DIFFRACTION; IR SPECTROSCOPY; MENZENSCHWAND

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0077-7757/2009/0129

Publication date: 2009-04-01

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