The crystal structure of the mineral legrandite, Zn4 (AsO4)2 (OH)2·2H2O, has been determined using the Patterson function and refined to an R factor of 5%. The arsenate groups are tetrahedrally coordinated and zinc atoms are four to six coordinated by oxygen. The structure contains an infinite, undulating, edge-sharing chain of zinc polyhedra parallel to the a axis which is weakened once per repeat unit by the presence ot a 2.99 Å Zn-0 bond. The arsenate tetrahedra share apices with the zinc polyhedra and serve to link chains together.

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