BaMnSi2 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 10-coordinate geometry to one Mn(1), four equivalent Si(1), and five equivalent Si(2) atoms. Mn(1) is bonded in a 4-coordinate geometry to one Ba(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 distorted linear geometry to four equivalent Ba(1) and two equivalent Mn(1) atoms. In the second Si site, Si(2) is bonded in a 2-coordinate geometry to five equivalent Ba(1) and two equivalent Mn(1) atoms.
BaMnSi2 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 10-coordinate geometry to one Mn(1), four equivalent Si(1), and five equivalent Si(2) atoms. The Ba(1)-Mn(1) bond length is 3.31 Å. There are two shorter (3.42 Å) and two longer (3.47 Å) Ba(1)-Si(1) bond lengths. There are a spread of Ba(1)-Si(2) bond distances ranging from 3.39-3.74 Å. Mn(1) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Si(1), and two equivalent Si(2) atoms. Both Mn(1)-Si(1) bond lengths are 2.15 Å. Both Mn(1)-Si(2) bond lengths are 2.23 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted linear geometry to four equivalent Ba(1) and two equivalent Mn(1) atoms. In the second Si site, Si(2) is bonded in a 2-coordinate geometry to five equivalent Ba(1) and two equivalent Mn(1) atoms.