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Crystal chemistry of beryllophosphates: The crystal structure of moraesite, Be~2~(PO~4~)(OH) · 4H~2~O by Stefano Merlino; Marco Pasero is a Chemistry article available to read on EtoBox.

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## Abstract Moraesite, Be~2~(PO~4~)(OH) · 4H~2~O, is a hydrated beryllophosphate mineral. The crystal structure of moraesite from Humaita, Brazil has been solved and refined in the space group __C__2/__c__, __a__ = 8.553(6), __b__ = 12.319(6), __c__ = 7.155(8) Å, __β__ = 97.93(9)°, up to __R__ = 0.062 for 262 reflections. The structure is characterized by infinite double chains, running along __c__, formed by [PO~4~] and [BeO~2~(OH)H~2~O] tetrahedra. Within such chains three- and four-membered rings of tetrahedra occur. Additional water molecules, not linked to any cation, fill the large channels of the structure. Within each channel, the hydrogen bonds assume either of two schemes. Evidences were obtained that the true unit cell of moraesite is three times larger, with a __b__ parameter of 36.96 Å and space group symmetry __Cc__. It is suggested that the ordering of the hydrogen bond system, concerted with minor adjustments of the structure, could be responsible for the triplication of the __b__ axis.

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Author

Stefano Merlino; Marco Pasero

Publisher

Walter de Gruyter GmbH

Published

1992

Language

EN

Field

Chemistry (Physical Sciences)