Original paper

Arsenuranospathite, Al(UO2)2(AsO4)2F20H2O: Formula revision and relationships with allied uranyl arsenates and phosphates

Chukanov, N.V. Möckel


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.


arsenuranospathitechemical compositionx-ray diffractionir spectroscopymenzenschwand