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Mg2Ag crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two Mg2Ag sheets oriented in the (0, 1, 0) direction. Mg is bonded in a 4-coordinate geometry to four equivalent Ag atoms. There are a spread of Mg–Ag bond distances ranging from 2.87–2.92 Å. Ag is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
Mg2Ag crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to four equivalent Ag atoms. There are two shorter (2.85 Å) and two longer (3.14 Å) Mg–Ag bond lengths. In the second Mg site, Mg is bonded in a 12-coordinate geometry to six equivalent Ag atoms. There are two shorter (2.98 Å) and four longer (3.00 Å) Mg–Ag bond lengths. Ag is bonded in a 12-coordinate geometry to ten Mg atoms.