LiAlH4 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one H(1), one H(3), one H(4), and two equivalent H(2) atoms to form LiH5 trigonal bipyramids that share corners with five equivalent Al(1)H4 tetrahedra and  an edgeedge with one Li(1)H5 trigonal bipyramid. Al(1) is bonded to one H(1), one H(2), one H(3), and one H(4) atom to form AlH4 tetrahedra that share corners with five equivalent Li(1)H5 trigonal bipyramids. There are four inequivalent H sites. In the first H site, H(1) is bonded in a bent 150 degrees geometry to one Li(1) and one Al(1) atom. In the second H site, H(2) is bonded in a trigonal planar geometry to two equivalent Li(1) and one Al(1) atom. In the third H site, H(3) is bonded in a bent 150 degrees geometry to one Li(1) and one Al(1) atom. In the fourth H site, H(4) is bonded in a bent 150 degrees geometry to one Li(1) and one Al(1) atom.
LiAlH4 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one H(1), one H(3), one H(4), and two equivalent H(2) atoms to form LiH5 trigonal bipyramids that share corners with five equivalent Al(1)H4 tetrahedra and  an edgeedge with one Li(1)H5 trigonal bipyramid. The Li(1)-H(1) bond length is 1.91 Å. The Li(1)-H(3) bond length is 1.87 Å. The Li(1)-H(4) bond length is 1.88 Å. There is one shorter (1.94 Å) and one longer (2.01 Å) Li(1)-H(2) bond length. Al(1) is bonded to one H(1), one H(2), one H(3), and one H(4) atom to form AlH4 tetrahedra that share corners with five equivalent Li(1)H5 trigonal bipyramids. The Al(1)-H(1) bond length is 1.63 Å. The Al(1)-H(2) bond length is 1.64 Å. The Al(1)-H(3) bond length is 1.63 Å. The Al(1)-H(4) bond length is 1.62 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a bent 150 degrees geometry to one Li(1) and one Al(1) atom. In the second H site, H(2) is bonded in a trigonal planar geometry to two equivalent Li(1) and one Al(1) atom. In the third H site, H(3) is bonded in a bent 150 degrees geometry to one Li(1) and one Al(1) atom. In the fourth H site, H(4) is bonded in a bent 150 degrees geometry to one Li(1) and one Al(1) atom.