THE STRUCTURE AND COMPOSITION OF URANOSPATHITE, Al1−x□x[(UO2)(PO4)]2(H2O)20+3xF1−3x, 0 < x < 0.33, A NON-CENTROSYMMETRIC FLUORINE-BEARING MINERAL OF THE AUTUNITE GROUP, AND OF A RELATED SYNTHETIC LOWER HYDRATE, Al0.67□0.33[(UO2)(PO4)]2(H2O)15.5