KMg6Si crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), four equivalent Mg(3), and two equivalent Si(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to one K(1), two equivalent Mg(4), and two equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(4), and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent Mg(2), and one Si(1) atom. In the fourth Mg site, Mg(4) is bonded in a 6-coordinate geometry to two equivalent Mg(2) and four equivalent Mg(1) atoms. Si(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(3), and four equivalent Mg(1) atoms.
KMg6Si crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), four equivalent Mg(3), and two equivalent Si(1) atoms. Both K(1)-Mg(1) bond lengths are 3.38 Å. Both K(1)-Mg(2) bond lengths are 3.31 Å. All K(1)-Mg(3) bond lengths are 3.59 Å. Both K(1)-Si(1) bond lengths are 3.40 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to one K(1), two equivalent Mg(4), and two equivalent Si(1) atoms. Both Mg(1)-Mg(4) bond lengths are 3.24 Å. Both Mg(1)-Si(1) bond lengths are 2.86 Å. In the second Mg site, Mg(2) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(4), and four equivalent Mg(3) atoms. Both Mg(2)-Mg(4) bond lengths are 3.32 Å. All Mg(2)-Mg(3) bond lengths are 3.06 Å. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent Mg(2), and one Si(1) atom. The Mg(3)-Si(1) bond length is 2.85 Å. In the fourth Mg site, Mg(4) is bonded in a 6-coordinate geometry to two equivalent Mg(2) and four equivalent Mg(1) atoms. Si(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(3), and four equivalent Mg(1) atoms.