In2O3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(3), three equivalent O(1), and three equivalent O(2) atoms to form distorted edge-sharing InO7 pentagonal bipyramids. In the second In site, In(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), and four equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one In(2) and three equivalent In(1) atoms to form distorted OIn4 trigonal pyramids that share corners with five equivalent O(2)In5 trigonal bipyramids, corners with seven equivalent O(3)In5 trigonal bipyramids, corners with two equivalent O(1)In4 trigonal pyramids, edges with three equivalent O(2)In5 trigonal bipyramids, and edges with two equivalent O(1)In4 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent In(2) and three equivalent In(1) atoms to form distorted OIn5 trigonal bipyramids that share corners with six equivalent O(3)In5 trigonal bipyramids, corners with five equivalent O(1)In4 trigonal pyramids,  an edgeedge with one O(3)In5 trigonal bipyramid, edges with four equivalent O(2)In5 trigonal bipyramids, edges with three equivalent O(1)In4 trigonal pyramids, and  a faceface with one O(3)In5 trigonal bipyramid. In the third O site, O(3) is bonded to one In(1) and four equivalent In(2) atoms to form distorted OIn5 trigonal bipyramids that share corners with four equivalent O(3)In5 trigonal bipyramids, corners with six equivalent O(2)In5 trigonal bipyramids, corners with seven equivalent O(1)In4 trigonal pyramids,  an edgeedge with one O(2)In5 trigonal bipyramid, edges with four equivalent O(3)In5 trigonal bipyramids, and  a faceface with one O(2)In5 trigonal bipyramid.
In2O3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(3), three equivalent O(1), and three equivalent O(2) atoms to form distorted edge-sharing InO7 pentagonal bipyramids. The In(1)-O(3) bond length is 2.34 Å. There are two shorter (2.14 Å) and one longer (2.43 Å) In(1)-O(1) bond length. There is one shorter (2.27 Å) and two longer (2.35 Å) In(1)-O(2) bond lengths. In the second In site, In(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), and four equivalent O(3) atoms. The In(2)-O(1) bond length is 2.38 Å. Both In(2)-O(2) bond lengths are 2.32 Å. There are two shorter (2.19 Å) and two longer (2.51 Å) In(2)-O(3) bond lengths. There are three inequivalent O sites. In the first O site, O(1) is bonded to one In(2) and three equivalent In(1) atoms to form distorted OIn4 trigonal pyramids that share corners with five equivalent O(2)In5 trigonal bipyramids, corners with seven equivalent O(3)In5 trigonal bipyramids, corners with two equivalent O(1)In4 trigonal pyramids, edges with three equivalent O(2)In5 trigonal bipyramids, and edges with two equivalent O(1)In4 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent In(2) and three equivalent In(1) atoms to form distorted OIn5 trigonal bipyramids that share corners with six equivalent O(3)In5 trigonal bipyramids, corners with five equivalent O(1)In4 trigonal pyramids,  an edgeedge with one O(3)In5 trigonal bipyramid, edges with four equivalent O(2)In5 trigonal bipyramids, edges with three equivalent O(1)In4 trigonal pyramids, and  a faceface with one O(3)In5 trigonal bipyramid. In the third O site, O(3) is bonded to one In(1) and four equivalent In(2) atoms to form distorted OIn5 trigonal bipyramids that share corners with four equivalent O(3)In5 trigonal bipyramids, corners with six equivalent O(2)In5 trigonal bipyramids, corners with seven equivalent O(1)In4 trigonal pyramids,  an edgeedge with one O(2)In5 trigonal bipyramid, edges with four equivalent O(3)In5 trigonal bipyramids, and  a faceface with one O(2)In5 trigonal bipyramid.