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ct-Ca3(PO4) 2 crystallizes in the monoclinic space group P2Ja with a= 12.887(2), b=27.280(4), c--15.219 (2) ,~,/~ = 126.20(1) °, and Z = 24. An approximate subcell with b' = b/3 exists. The structure was solved by direct methods of phase determination and refined to R = 0.051 and R,= 0.049 with 7002 reflections collected from a single crystal by counter methods. The structure consists of columns of cations, and columns of cations and anions with compensating cation vacancies, and is closely related to the structure of K3Na(SO4) 2, the mineral glaserite. The calcium ions in ct-Caa(PO4) 2 exhibit a wide range of coordination numbers and geometries.

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