BaSrI4 is Hydrophilite-derived structured and crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one I(2), one I(4), two equivalent I(1), and two equivalent I(3) atoms to form distorted BaI6 pentagonal pyramids that share corners with two equivalent Ba(1)I6 pentagonal pyramids, corners with five equivalent Sr(1)I6 pentagonal pyramids,  an edgeedge with one Ba(1)I6 pentagonal pyramid, and  a faceface with one Sr(1)I6 pentagonal pyramid. Sr(1) is bonded to one I(1), one I(3), two equivalent I(2), and two equivalent I(4) atoms to form distorted SrI6 pentagonal pyramids that share corners with two equivalent Sr(1)I6 pentagonal pyramids, corners with five equivalent Ba(1)I6 pentagonal pyramids,  an edgeedge with one Sr(1)I6 pentagonal pyramid, and  a faceface with one Ba(1)I6 pentagonal pyramid. There are four inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to two equivalent Ba(1) and one Sr(1) atom. In the second I site, I(2) is bonded in a trigonal non-coplanar geometry to one Ba(1) and two equivalent Sr(1) atoms. In the third I site, I(3) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Sr(1) atom. In the fourth I site, I(4) is bonded in a trigonal planar geometry to one Ba(1) and two equivalent Sr(1) atoms.
BaSrI4 is Hydrophilite-derived structured and crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one I(2), one I(4), two equivalent I(1), and two equivalent I(3) atoms to form distorted BaI6 pentagonal pyramids that share corners with two equivalent Ba(1)I6 pentagonal pyramids, corners with five equivalent Sr(1)I6 pentagonal pyramids,  an edgeedge with one Ba(1)I6 pentagonal pyramid, and  a faceface with one Sr(1)I6 pentagonal pyramid. The Ba(1)-I(2) bond length is 3.47 Å. The Ba(1)-I(4) bond length is 3.56 Å. There is one shorter (3.40 Å) and one longer (3.56 Å) Ba(1)-I(1) bond length. There is one shorter (3.46 Å) and one longer (3.48 Å) Ba(1)-I(3) bond length. Sr(1) is bonded to one I(1), one I(3), two equivalent I(2), and two equivalent I(4) atoms to form distorted SrI6 pentagonal pyramids that share corners with two equivalent Sr(1)I6 pentagonal pyramids, corners with five equivalent Ba(1)I6 pentagonal pyramids,  an edgeedge with one Sr(1)I6 pentagonal pyramid, and  a faceface with one Ba(1)I6 pentagonal pyramid. The Sr(1)-I(1) bond length is 3.27 Å. The Sr(1)-I(3) bond length is 3.50 Å. There is one shorter (3.40 Å) and one longer (3.41 Å) Sr(1)-I(2) bond length. There is one shorter (3.36 Å) and one longer (3.41 Å) Sr(1)-I(4) bond length. There are four inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to two equivalent Ba(1) and one Sr(1) atom. In the second I site, I(2) is bonded in a trigonal non-coplanar geometry to one Ba(1) and two equivalent Sr(1) atoms. In the third I site, I(3) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Sr(1) atom. In the fourth I site, I(4) is bonded in a trigonal planar geometry to one Ba(1) and two equivalent Sr(1) atoms.