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Rb2Mg crystallizes in the orthorhombic Cmcm space group. The structure is one-dimensional and consists of two Rb2Mg ribbons oriented in the (0, 0, 1) direction. Rb is bonded in a 3-coordinate geometry to three equivalent Mg atoms. There are one shorter (3.83 Å) and two longer (4.01 Å) Rb–Mg bond lengths. Mg is bonded in a 8-coordinate geometry to six equivalent Rb and two equivalent Mg atoms. Both Mg–Mg bond lengths are 3.18 Å.
Rb2Mg crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two Rb2Mg sheets oriented in the (1, 0, 0) direction. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 9-coordinate geometry to four equivalent Mg atoms. There are two shorter (4.28 Å) and two longer (4.30 Å) Rb–Mg bond lengths. In the second Rb site, Rb is bonded in a 4-coordinate geometry to four equivalent Mg atoms. There are two shorter (4.01 Å) and two longer (4.04 Å) Rb–Mg bond lengths. Mg is bonded in a 9-coordinate geometry to eight Rb and one Mg atom. The Mg–Mg bond length is 3.18 Å.
Rb2Mg crystallizes in the monoclinic C2/m space group. The structure is one-dimensional and consists of two Rb2Mg ribbons oriented in the (0, 1, 0) direction. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 2-coordinate geometry to two equivalent Mg atoms. Both Rb–Mg bond lengths are 4.10 Å. In the second Rb site, Rb is bonded in a 10-coordinate geometry to two equivalent Mg atoms. Both Rb–Mg bond lengths are 4.13 Å. Mg is bonded in a 6-coordinate geometry to four Rb and two equivalent Mg atoms. Both Mg–Mg bond lengths are 3.10 Å.
Rb2Mg is Khatyrkite structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 4-coordinate geometry to four equivalent Mg atoms. There are two shorter (4.12 Å) and two longer (4.15 Å) Rb–Mg bond lengths. In the second Rb site, Rb is bonded in a 4-coordinate geometry to four equivalent Mg atoms. There are two shorter (4.14 Å) and two longer (4.15 Å) Rb–Mg bond lengths. Mg is bonded in a 10-coordinate geometry to eight Rb atoms.