Ca3(PO4)2 crystallizes in the trigonal R-3m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. In the second Ca site, Ca(2) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. P(1) is bonded in a tetrahedral geometry to one O(2) and three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ca(1), three equivalent Ca(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(2) and one P(1) atom.
Ca3(PO4)2 crystallizes in the trigonal R-3m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. All Ca(1)-O(1) bond lengths are 2.43 Å. In the second Ca site, Ca(2) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. The Ca(2)-O(2) bond length is 2.24 Å. There are three shorter (2.48 Å) and six longer (2.68 Å) Ca(2)-O(1) bond lengths. P(1) is bonded in a tetrahedral geometry to one O(2) and three equivalent O(1) atoms. The P(1)-O(2) bond length is 1.52 Å. All P(1)-O(1) bond lengths are 1.54 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ca(1), three equivalent Ca(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(2) and one P(1) atom.