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GdHg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded in a body-centered cubic geometry to eight equivalent Hg atoms. All Gd–Hg bond lengths are 3.26 Å. Hg is bonded in a body-centered cubic geometry to eight equivalent Gd atoms.
GdHg3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Gd is bonded to twelve Hg atoms to form a mixture of face and corner-sharing GdHg12 cuboctahedra. There are a spread of Gd–Hg bond distances ranging from 3.20–3.37 Å. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 4-coordinate geometry to four equivalent Gd atoms. In the second Hg site, Hg is bonded in a 4-coordinate geometry to four equivalent Gd atoms.