ScMnSi crystallizes in the hexagonal P-62m space group. Sc(1) is bonded in a 11-coordinate geometry to six equivalent Mn(1), one Si(1), and four equivalent Si(2) atoms. Mn(1) is bonded in a 4-coordinate geometry to six equivalent Sc(1), two equivalent Si(1), and two equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to three equivalent Sc(1) and six equivalent Mn(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Sc(1) and three equivalent Mn(1) atoms.
ScMnSi crystallizes in the hexagonal P-62m space group. Sc(1) is bonded in a 11-coordinate geometry to six equivalent Mn(1), one Si(1), and four equivalent Si(2) atoms. There are two shorter (2.99 Å) and four longer (3.09 Å) Sc(1)-Mn(1) bond lengths. The Sc(1)-Si(1) bond length is 2.77 Å. All Sc(1)-Si(2) bond lengths are 2.78 Å. Mn(1) is bonded in a 4-coordinate geometry to six equivalent Sc(1), two equivalent Si(1), and two equivalent Si(2) atoms. Both Mn(1)-Si(1) bond lengths are 2.51 Å. Both Mn(1)-Si(2) bond lengths are 2.58 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to three equivalent Sc(1) and six equivalent Mn(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Sc(1) and three equivalent Mn(1) atoms.