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The title compound, sodium calcium trimagnesium tris­(arsenate), an alluaudite-like arsenate, was prepared by solid-state reaction at high temperature. The structure is built up from edge-sharing MgO 6  octa­hedra in chains associated with the AsO 4  arsenate groups. The three-dimensional network leads to two different tunnels occupied statistically by Na +  and Ca 2+ . One As and one Mg atom lie on twofold rotation axes; one Na and one Ca are disordered over two sites with occupancies of 0.7 and 0.3 and these sites lie on a twofold rotation axis and an inversion centre, respectively.

The alluaudite-like arsenate NaCaMg3(AsO4)3

The alluaudite-like arsenate NaCaMg₃(AsO₄)₃