Ca4CrAl3BSiO14 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(14), one O(3), one O(4), and one O(7) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(2), one O(3), one O(4), one O(8), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(5), one O(8), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(2), one O(5), one O(6), and one O(7) atom. Cr(1) is bonded to one O(1), one O(14), one O(6), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one B(1)O4 tetrahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(5), one O(7), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(10), one O(4), one O(6), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. In the third Al site, Al(3) is bonded to one O(13), one O(2), one O(5), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. B(1) is bonded to one O(1), one O(12), one O(4), and one O(9) atom to form BO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Al(2)O4 tetrahedra. Si(1) is bonded to one O(10), one O(11), one O(2), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one Al(3)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(3), one Cr(1), and one B(1) atom to form distorted OCa2CrB trigonal pyramids that share  a cornercorner with one O(13)Ca3Al tetrahedra,  a cornercorner with one O(14)Ca3Cr tetrahedra, and  an edgeedge with one O(14)Ca3Cr tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(4), one Al(3), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ca(1), one Ca(2), one Al(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Al(2), and one B(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(4), one Al(1), and one Al(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(4), one Cr(1), and one Al(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Cr(1), and one Al(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Ca(3), one Al(2), and one Al(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Al(1), and one B(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(4), one Al(2), and one Si(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(4), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), and one B(1) atom. In the thirteenth O site, O(13) is bonded to one Ca(2), one Ca(3), one Ca(4), and one Al(3) atom to form distorted OCa3Al tetrahedra that share corners with two equivalent O(14)Ca3Cr tetrahedra and  a cornercorner with one O(1)Ca2CrB trigonal pyramid. In the fourteenth O site, O(14) is bonded to one Ca(1), one Ca(3), one Ca(4), and one Cr(1) atom to form distorted OCa3Cr tetrahedra that share corners with two equivalent O(13)Ca3Al tetrahedra,  a cornercorner with one O(1)Ca2CrB trigonal pyramid, and  an edgeedge with one O(1)Ca2CrB trigonal pyramid.
Ca4CrAl3BSiO14 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(14), one O(3), one O(4), and one O(7) atom. The Ca(1)-O(1) bond length is 2.40 Å. The Ca(1)-O(10) bond length is 2.39 Å. The Ca(1)-O(11) bond length is 2.45 Å. The Ca(1)-O(12) bond length is 2.67 Å. The Ca(1)-O(14) bond length is 2.56 Å. The Ca(1)-O(3) bond length is 2.50 Å. The Ca(1)-O(4) bond length is 2.55 Å. The Ca(1)-O(7) bond length is 2.89 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(2), one O(3), one O(4), one O(8), and one O(9) atom. The Ca(2)-O(11) bond length is 2.78 Å. The Ca(2)-O(12) bond length is 2.43 Å. The Ca(2)-O(13) bond length is 2.52 Å. The Ca(2)-O(2) bond length is 2.49 Å. The Ca(2)-O(3) bond length is 3.01 Å. The Ca(2)-O(4) bond length is 2.40 Å. The Ca(2)-O(8) bond length is 2.70 Å. The Ca(2)-O(9) bond length is 2.43 Å. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(5), one O(8), and one O(9) atom. The Ca(3)-O(1) bond length is 2.42 Å. The Ca(3)-O(12) bond length is 2.68 Å. The Ca(3)-O(13) bond length is 2.36 Å. The Ca(3)-O(14) bond length is 2.60 Å. The Ca(3)-O(5) bond length is 2.37 Å. The Ca(3)-O(8) bond length is 2.49 Å. The Ca(3)-O(9) bond length is 2.76 Å. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(2), one O(5), one O(6), and one O(7) atom. The Ca(4)-O(10) bond length is 2.93 Å. The Ca(4)-O(11) bond length is 2.62 Å. The Ca(4)-O(13) bond length is 2.40 Å. The Ca(4)-O(14) bond length is 2.57 Å. The Ca(4)-O(2) bond length is 2.41 Å. The Ca(4)-O(5) bond length is 2.67 Å. The Ca(4)-O(6) bond length is 2.43 Å. The Ca(4)-O(7) bond length is 2.41 Å. Cr(1) is bonded to one O(1), one O(14), one O(6), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one B(1)O4 tetrahedra. The Cr(1)-O(1) bond length is 1.81 Å. The Cr(1)-O(14) bond length is 1.73 Å. The Cr(1)-O(6) bond length is 1.82 Å. The Cr(1)-O(7) bond length is 1.84 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(5), one O(7), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The Al(1)-O(3) bond length is 1.78 Å. The Al(1)-O(5) bond length is 1.76 Å. The Al(1)-O(7) bond length is 1.80 Å. The Al(1)-O(9) bond length is 1.77 Å. In the second Al site, Al(2) is bonded to one O(10), one O(4), one O(6), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The Al(2)-O(10) bond length is 1.78 Å. The Al(2)-O(4) bond length is 1.77 Å. The Al(2)-O(6) bond length is 1.80 Å. The Al(2)-O(8) bond length is 1.75 Å. In the third Al site, Al(3) is bonded to one O(13), one O(2), one O(5), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The Al(3)-O(13) bond length is 1.73 Å. The Al(3)-O(2) bond length is 1.78 Å. The Al(3)-O(5) bond length is 1.78 Å. The Al(3)-O(8) bond length is 1.77 Å. B(1) is bonded to one O(1), one O(12), one O(4), and one O(9) atom to form BO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Al(2)O4 tetrahedra. The B(1)-O(1) bond length is 1.58 Å. The B(1)-O(12) bond length is 1.42 Å. The B(1)-O(4) bond length is 1.53 Å. The B(1)-O(9) bond length is 1.51 Å. Si(1) is bonded to one O(10), one O(11), one O(2), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one Al(3)O4 tetrahedra. The Si(1)-O(10) bond length is 1.66 Å. The Si(1)-O(11) bond length is 1.61 Å. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.65 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(3), one Cr(1), and one B(1) atom to form distorted OCa2CrB trigonal pyramids that share  a cornercorner with one O(13)Ca3Al tetrahedra,  a cornercorner with one O(14)Ca3Cr tetrahedra, and  an edgeedge with one O(14)Ca3Cr tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(4), one Al(3), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ca(1), one Ca(2), one Al(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Al(2), and one B(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(4), one Al(1), and one Al(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(4), one Cr(1), and one Al(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Cr(1), and one Al(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Ca(3), one Al(2), and one Al(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Al(1), and one B(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(4), one Al(2), and one Si(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(4), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), and one B(1) atom. In the thirteenth O site, O(13) is bonded to one Ca(2), one Ca(3), one Ca(4), and one Al(3) atom to form distorted OCa3Al tetrahedra that share corners with two equivalent O(14)Ca3Cr tetrahedra and  a cornercorner with one O(1)Ca2CrB trigonal pyramid. In the fourteenth O site, O(14) is bonded to one Ca(1), one Ca(3), one Ca(4), and one Cr(1) atom to form distorted OCa3Cr tetrahedra that share corners with two equivalent O(13)Ca3Al tetrahedra,  a cornercorner with one O(1)Ca2CrB trigonal pyramid, and  an edgeedge with one O(1)Ca2CrB trigonal pyramid.