Th2Ga is Khatyrkite structured and crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Th is bonded in a 4-coordinate geometry to four equivalent Ga atoms. All Th–Ga bond lengths are 3.19 Å. Ga is bonded in a 10-coordinate geometry to eight equivalent Th and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.95 Å.