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Abstract:
Metavariscite, AlPO 4.2H 2O, monoclinic, P2 1/ n, a=5.178 (2),
b=9.514 (2), c=8.454 (2) Aring, beta=90.35 (2)deg, Z=4, Dm=2.54,
Dx=2.535 g cm -3. PO 4 tetrahedra share vertices with four AlO 4(OH 2) 2
octahedra and vice versa. With Al...O distances of 1.892 (2) and 1.953
(2) Aring the two waters coordinate the aluminum in cis-position and
donate two single and quite short and two bifurcated longer hydrogen
bonds, respectively, to phosphate oxygens. None of the hydrogen bonds is
along an octahedron edge.
