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Sr2HgGe crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Sr2HgGe ribbons oriented in the (1, 0, 0) direction. Sr is bonded in a linear geometry to one Hg and one Ge atom. The Sr–Hg bond length is 3.54 Å. The Sr–Ge bond length is 2.87 Å. Hg is bonded in a linear geometry to two equivalent Sr atoms. Ge is bonded in a linear geometry to two equivalent Sr atoms.
Sr2HgGe is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sr is bonded in a body-centered cubic geometry to four equivalent Hg and four equivalent Ge atoms. All Sr–Hg bond lengths are 3.41 Å. All Sr–Ge bond lengths are 3.41 Å. Hg is bonded in a body-centered cubic geometry to eight equivalent Sr atoms. Ge is bonded in a body-centered cubic geometry to eight equivalent Sr atoms.