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BeRu2As crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two BeRu2As ribbons oriented in the (1, 0, 0) direction. Be is bonded in a linear geometry to two equivalent Ru atoms. Both Be–Ru bond lengths are 2.33 Å. Ru is bonded in a linear geometry to one Be and one As atom. The Ru–As bond length is 2.26 Å. As is bonded in a linear geometry to two equivalent Ru atoms.
BeRu2As is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Be is bonded in a body-centered cubic geometry to eight equivalent Ru atoms. All Be–Ru bond lengths are 2.53 Å. Ru is bonded in a distorted body-centered cubic geometry to four equivalent Be and four equivalent As atoms. All Ru–As bond lengths are 2.53 Å. As is bonded in a body-centered cubic geometry to eight equivalent Ru atoms.