GaAsO4 is Hydrophilite-derived structured and crystallizes in the monoclinic C2 space group. There are five inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(12), one O(15), one O(17), one O(2), one O(6), and one O(8) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra, corners with two equivalent As(2)O6 octahedra, corners with two equivalent As(4)O6 octahedra, and  an edgeedge with one As(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-56°. In the second Ga site, Ga(2) is bonded to one O(1), one O(11), one O(14), one O(3), one O(4), and one O(7) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra, corners with two equivalent As(2)O6 octahedra, corners with two equivalent As(4)O6 octahedra, and  an edgeedge with one As(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-56°. In the third Ga site, Ga(3) is bonded to one O(10), one O(13), one O(16), one O(18), one O(5), and one O(9) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra, corners with two equivalent As(2)O6 octahedra, corners with two equivalent As(4)O6 octahedra, and  an edgeedge with one As(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. In the fourth Ga site, Ga(4) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(13) atoms to form GaO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra, and edges with two equivalent As(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. In the fifth Ga site, Ga(5) is bonded to one O(10), one O(11), one O(14), one O(15), one O(16), and one O(17) atom to form GaO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra,  an edgeedge with one As(2)O6 octahedra, and  an edgeedge with one As(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-56°. There are five inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra,  an edgeedge with one As(2)O6 octahedra, and  an edgeedge with one As(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-54°. In the second As site, As(2) is bonded to one O(10), one O(11), one O(5), one O(6), one O(7), and one O(8) atom to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra,  an edgeedge with one Ga(5)O6 octahedra,  an edgeedge with one As(1)O6 octahedra, and  an edgeedge with one As(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. In the third As site, As(3) is bonded to one O(12), one O(14), one O(17), one O(18), one O(4), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra,  an edgeedge with one Ga(1)O6 octahedra,  an edgeedge with one Ga(2)O6 octahedra, and  an edgeedge with one Ga(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. In the fourth As site, As(4) is bonded to one O(1), one O(13), one O(15), one O(16), one O(2), and one O(3) atom to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra,  an edgeedge with one Ga(4)O6 octahedra,  an edgeedge with one Ga(5)O6 octahedra, and  an edgeedge with one As(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. In the fifth As site, As(5) is bonded to two equivalent O(18), two equivalent O(6), and two equivalent O(7) atoms to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra, and edges with two equivalent As(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-53°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ga(2), one Ga(4), and one As(4) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ga(1), one As(1), and one As(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ga(2), one As(1), and one As(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ga(2), one As(1), and one As(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Ga(3), one As(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ga(1), one As(2), and one As(5) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ga(2), one As(2), and one As(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ga(1), one As(1), and one As(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Ga(3), one As(1), and one As(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ga(3), one Ga(5), and one As(2) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Ga(2), one Ga(5), and one As(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ga(1), one Ga(4), and one As(3) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Ga(3), one Ga(4), and one As(4) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ga(2), one Ga(5), and one As(3) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Ga(1), one Ga(5), and one As(4) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Ga(3), one Ga(5), and one As(4) atom. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Ga(1), one Ga(5), and one As(3) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Ga(3), one As(3), and one As(5) atom.
GaAsO4 is Hydrophilite-derived structured and crystallizes in the monoclinic C2 space group. There are five inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(12), one O(15), one O(17), one O(2), one O(6), and one O(8) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra, corners with two equivalent As(2)O6 octahedra, corners with two equivalent As(4)O6 octahedra, and  an edgeedge with one As(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-56°. The Ga(1)-O(12) bond length is 2.00 Å. The Ga(1)-O(15) bond length is 1.93 Å. The Ga(1)-O(17) bond length is 2.00 Å. The Ga(1)-O(2) bond length is 2.01 Å. The Ga(1)-O(6) bond length is 2.09 Å. The Ga(1)-O(8) bond length is 2.14 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(11), one O(14), one O(3), one O(4), and one O(7) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra, corners with two equivalent As(2)O6 octahedra, corners with two equivalent As(4)O6 octahedra, and  an edgeedge with one As(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-56°. The Ga(2)-O(1) bond length is 1.91 Å. The Ga(2)-O(11) bond length is 1.99 Å. The Ga(2)-O(14) bond length is 2.00 Å. The Ga(2)-O(3) bond length is 2.18 Å. The Ga(2)-O(4) bond length is 2.10 Å. The Ga(2)-O(7) bond length is 2.03 Å. In the third Ga site, Ga(3) is bonded to one O(10), one O(13), one O(16), one O(18), one O(5), and one O(9) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra, corners with two equivalent As(2)O6 octahedra, corners with two equivalent As(4)O6 octahedra, and  an edgeedge with one As(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. The Ga(3)-O(10) bond length is 1.93 Å. The Ga(3)-O(13) bond length is 2.02 Å. The Ga(3)-O(16) bond length is 2.01 Å. The Ga(3)-O(18) bond length is 2.16 Å. The Ga(3)-O(5) bond length is 2.00 Å. The Ga(3)-O(9) bond length is 2.08 Å. In the fourth Ga site, Ga(4) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(13) atoms to form GaO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra, and edges with two equivalent As(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. Both Ga(4)-O(1) bond lengths are 2.03 Å. Both Ga(4)-O(12) bond lengths are 1.94 Å. Both Ga(4)-O(13) bond lengths are 1.99 Å. In the fifth Ga site, Ga(5) is bonded to one O(10), one O(11), one O(14), one O(15), one O(16), and one O(17) atom to form GaO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra,  an edgeedge with one As(2)O6 octahedra, and  an edgeedge with one As(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-56°. The Ga(5)-O(10) bond length is 2.05 Å. The Ga(5)-O(11) bond length is 1.98 Å. The Ga(5)-O(14) bond length is 2.00 Å. The Ga(5)-O(15) bond length is 2.10 Å. The Ga(5)-O(16) bond length is 1.95 Å. The Ga(5)-O(17) bond length is 1.93 Å. There are five inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra,  an edgeedge with one As(2)O6 octahedra, and  an edgeedge with one As(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-54°. The As(1)-O(2) bond length is 1.92 Å. The As(1)-O(3) bond length is 1.84 Å. The As(1)-O(4) bond length is 1.85 Å. The As(1)-O(5) bond length is 1.91 Å. The As(1)-O(8) bond length is 1.87 Å. The As(1)-O(9) bond length is 1.91 Å. In the second As site, As(2) is bonded to one O(10), one O(11), one O(5), one O(6), one O(7), and one O(8) atom to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra,  an edgeedge with one Ga(5)O6 octahedra,  an edgeedge with one As(1)O6 octahedra, and  an edgeedge with one As(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. The As(2)-O(10) bond length is 1.79 Å. The As(2)-O(11) bond length is 1.81 Å. The As(2)-O(5) bond length is 1.88 Å. The As(2)-O(6) bond length is 1.91 Å. The As(2)-O(7) bond length is 1.86 Å. The As(2)-O(8) bond length is 1.89 Å. In the third As site, As(3) is bonded to one O(12), one O(14), one O(17), one O(18), one O(4), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one As(5)O6 octahedra, corners with two equivalent Ga(5)O6 octahedra, corners with two equivalent As(1)O6 octahedra,  an edgeedge with one Ga(1)O6 octahedra,  an edgeedge with one Ga(2)O6 octahedra, and  an edgeedge with one Ga(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. The As(3)-O(12) bond length is 1.80 Å. The As(3)-O(14) bond length is 1.81 Å. The As(3)-O(17) bond length is 1.81 Å. The As(3)-O(18) bond length is 1.91 Å. The As(3)-O(4) bond length is 1.89 Å. The As(3)-O(9) bond length is 1.93 Å. In the fourth As site, As(4) is bonded to one O(1), one O(13), one O(15), one O(16), one O(2), and one O(3) atom to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra,  an edgeedge with one Ga(4)O6 octahedra,  an edgeedge with one Ga(5)O6 octahedra, and  an edgeedge with one As(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. The As(4)-O(1) bond length is 1.84 Å. The As(4)-O(13) bond length is 1.83 Å. The As(4)-O(15) bond length is 1.82 Å. The As(4)-O(16) bond length is 1.84 Å. The As(4)-O(2) bond length is 1.92 Å. The As(4)-O(3) bond length is 1.93 Å. In the fifth As site, As(5) is bonded to two equivalent O(18), two equivalent O(6), and two equivalent O(7) atoms to form AsO6 octahedra that share corners with two equivalent Ga(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, corners with two equivalent Ga(3)O6 octahedra, corners with two equivalent As(3)O6 octahedra, and edges with two equivalent As(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-53°. Both As(5)-O(18) bond lengths are 1.88 Å. Both As(5)-O(6) bond lengths are 1.84 Å. Both As(5)-O(7) bond lengths are 1.94 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ga(2), one Ga(4), and one As(4) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ga(1), one As(1), and one As(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ga(2), one As(1), and one As(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ga(2), one As(1), and one As(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Ga(3), one As(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ga(1), one As(2), and one As(5) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ga(2), one As(2), and one As(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ga(1), one As(1), and one As(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Ga(3), one As(1), and one As(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ga(3), one Ga(5), and one As(2) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Ga(2), one Ga(5), and one As(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ga(1), one Ga(4), and one As(3) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Ga(3), one Ga(4), and one As(4) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ga(2), one Ga(5), and one As(3) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Ga(1), one Ga(5), and one As(4) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Ga(3), one Ga(5), and one As(4) atom. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Ga(1), one Ga(5), and one As(3) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Ga(3), one As(3), and one As(5) atom.