CaMn2(PO4)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), one O(16), one O(2), and one O(3) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(12), one O(14), one O(4), one O(6), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(15), one O(2), one O(3), one O(7), and one O(9) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the third Mn site, Mn(3) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(15), one O(3), one O(4), and one O(6) atom. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(12), one O(14), one O(16), one O(5), one O(7), and one O(9) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(10), one O(11), one O(12), and one O(15) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and  a cornercorner with one Mn(2)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and corners with two equivalent Mn(2)O5 trigonal bipyramids. In the third P site, P(3) is bonded to one O(1), one O(13), one O(4), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and  a cornercorner with one Mn(2)O5 trigonal bipyramid. In the fourth P site, P(4) is bonded to one O(14), one O(16), one O(2), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(2)O5 trigonal bipyramid and corners with two equivalent Mn(1)O5 trigonal bipyramids. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(3), and one P(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(2), and one P(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ca(1), one Mn(2), one Mn(3), and one P(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(1), one Mn(3), and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ca(2), one Mn(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Ca(2), one Mn(1), one Mn(3), and one P(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(2), one Mn(4), and one P(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(2), and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ca(1), one Mn(3), and one P(1) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(4), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(2), and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(1), one Mn(4), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(2), one Mn(3), and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Ca(1), one Mn(4), and one P(4) atom.
CaMn2(PO4)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), one O(16), one O(2), and one O(3) atom. The Ca(1)-O(10) bond length is 2.57 Å. The Ca(1)-O(11) bond length is 2.42 Å. The Ca(1)-O(13) bond length is 2.32 Å. The Ca(1)-O(14) bond length is 2.52 Å. The Ca(1)-O(15) bond length is 2.70 Å. The Ca(1)-O(16) bond length is 2.86 Å. The Ca(1)-O(2) bond length is 2.44 Å. The Ca(1)-O(3) bond length is 2.83 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The Ca(2)-O(1) bond length is 2.39 Å. The Ca(2)-O(10) bond length is 2.32 Å. The Ca(2)-O(13) bond length is 2.57 Å. The Ca(2)-O(4) bond length is 2.69 Å. The Ca(2)-O(5) bond length is 2.85 Å. The Ca(2)-O(6) bond length is 2.87 Å. The Ca(2)-O(7) bond length is 2.53 Å. The Ca(2)-O(8) bond length is 2.43 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(12), one O(14), one O(4), one O(6), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The Mn(1)-O(12) bond length is 2.16 Å. The Mn(1)-O(14) bond length is 2.16 Å. The Mn(1)-O(4) bond length is 2.20 Å. The Mn(1)-O(6) bond length is 2.24 Å. The Mn(1)-O(8) bond length is 2.08 Å. In the second Mn site, Mn(2) is bonded to one O(15), one O(2), one O(3), one O(7), and one O(9) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The Mn(2)-O(15) bond length is 2.20 Å. The Mn(2)-O(2) bond length is 2.07 Å. The Mn(2)-O(3) bond length is 2.23 Å. The Mn(2)-O(7) bond length is 2.16 Å. The Mn(2)-O(9) bond length is 2.16 Å. In the third Mn site, Mn(3) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(15), one O(3), one O(4), and one O(6) atom. The Mn(3)-O(1) bond length is 2.14 Å. The Mn(3)-O(11) bond length is 2.14 Å. The Mn(3)-O(15) bond length is 2.10 Å. The Mn(3)-O(3) bond length is 2.80 Å. The Mn(3)-O(4) bond length is 2.10 Å. The Mn(3)-O(6) bond length is 2.64 Å. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(12), one O(14), one O(16), one O(5), one O(7), and one O(9) atom. The Mn(4)-O(12) bond length is 2.13 Å. The Mn(4)-O(14) bond length is 2.68 Å. The Mn(4)-O(16) bond length is 2.08 Å. The Mn(4)-O(5) bond length is 2.09 Å. The Mn(4)-O(7) bond length is 2.69 Å. The Mn(4)-O(9) bond length is 2.12 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(10), one O(11), one O(12), and one O(15) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and  a cornercorner with one Mn(2)O5 trigonal bipyramid. The P(1)-O(10) bond length is 1.52 Å. The P(1)-O(11) bond length is 1.55 Å. The P(1)-O(12) bond length is 1.56 Å. The P(1)-O(15) bond length is 1.58 Å. In the second P site, P(2) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and corners with two equivalent Mn(2)O5 trigonal bipyramids. The P(2)-O(3) bond length is 1.57 Å. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(7) bond length is 1.56 Å. The P(2)-O(8) bond length is 1.55 Å. In the third P site, P(3) is bonded to one O(1), one O(13), one O(4), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and  a cornercorner with one Mn(2)O5 trigonal bipyramid. The P(3)-O(1) bond length is 1.55 Å. The P(3)-O(13) bond length is 1.51 Å. The P(3)-O(4) bond length is 1.57 Å. The P(3)-O(9) bond length is 1.56 Å. In the fourth P site, P(4) is bonded to one O(14), one O(16), one O(2), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(2)O5 trigonal bipyramid and corners with two equivalent Mn(1)O5 trigonal bipyramids. The P(4)-O(14) bond length is 1.56 Å. The P(4)-O(16) bond length is 1.54 Å. The P(4)-O(2) bond length is 1.55 Å. The P(4)-O(6) bond length is 1.57 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(3), and one P(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(2), and one P(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ca(1), one Mn(2), one Mn(3), and one P(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(1), one Mn(3), and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ca(2), one Mn(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Ca(2), one Mn(1), one Mn(3), and one P(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(2), one Mn(4), and one P(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(2), and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ca(1), one Mn(3), and one P(1) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(4), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(2), and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(1), one Mn(4), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(2), one Mn(3), and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Ca(1), one Mn(4), and one P(4) atom.