Ca3TaGa3Si2O14 crystallizes in the trigonal P321 space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Ta(1) is bonded to six equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Ga(1)O4 tetrahedra. Ga(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GaO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 64°. Si(1) is bonded to one O(3) and three equivalent O(2) atoms to form SiO4 tetrahedra that share corners with three equivalent Ga(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ta(1), and one Ga(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1), one Ga(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ca(1) and one Si(1) atom.
Ca3TaGa3Si2O14 crystallizes in the trigonal P321 space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Both Ca(1)-O(1) bond lengths are 2.38 Å. Both Ca(1)-O(3) bond lengths are 2.71 Å. There are two shorter (2.39 Å) and two longer (2.91 Å) Ca(1)-O(2) bond lengths. Ta(1) is bonded to six equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Ga(1)O4 tetrahedra. All Ta(1)-O(1) bond lengths are 2.00 Å. Ga(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GaO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 64°. Both Ga(1)-O(1) bond lengths are 1.86 Å. Both Ga(1)-O(2) bond lengths are 1.88 Å. Si(1) is bonded to one O(3) and three equivalent O(2) atoms to form SiO4 tetrahedra that share corners with three equivalent Ga(1)O4 tetrahedra. The Si(1)-O(3) bond length is 1.61 Å. All Si(1)-O(2) bond lengths are 1.67 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ta(1), and one Ga(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1), one Ga(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ca(1) and one Si(1) atom.