LiGaH4 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 distorted LiH5 trigonal bipyramids that share corners with five equivalent Ga(1)H4 tetrahedra and  an edgeedge with one Li(1)H5 trigonal bipyramid. Ga(1) is bonded to one H(1), one H(2), one H(3), and one H(4) atom to form GaH4 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 Ga(1) atom. In the second H site, H(2) is bonded in a trigonal planar geometry to two equivalent Li(1) and one Ga(1) atom. In the third H site, H(3) is bonded in a bent 150 degrees geometry to one Li(1) and one Ga(1) atom. In the fourth H site, H(4) is bonded in a bent 150 degrees geometry to one Li(1) and one Ga(1) atom.
LiGaH4 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 distorted LiH5 trigonal bipyramids that share corners with five equivalent Ga(1)H4 tetrahedra and  an edgeedge with one Li(1)H5 trigonal bipyramid. The Li(1)-H(1) bond length is 1.92 Å. The Li(1)-H(3) bond length is 1.85 Å. The Li(1)-H(4) bond length is 1.88 Å. There is one shorter (2.00 Å) and one longer (2.02 Å) Li(1)-H(2) bond length. Ga(1) is bonded to one H(1), one H(2), one H(3), and one H(4) atom to form GaH4 tetrahedra that share corners with five equivalent Li(1)H5 trigonal bipyramids. The Ga(1)-H(1) bond length is 1.59 Å. The Ga(1)-H(2) bond length is 1.62 Å. The Ga(1)-H(3) bond length is 1.59 Å. The Ga(1)-H(4) bond length is 1.59 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 Ga(1) atom. In the second H site, H(2) is bonded in a trigonal planar geometry to two equivalent Li(1) and one Ga(1) atom. In the third H site, H(3) is bonded in a bent 150 degrees geometry to one Li(1) and one Ga(1) atom. In the fourth H site, H(4) is bonded in a bent 150 degrees geometry to one Li(1) and one Ga(1) atom.