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(3), four equivalent Mg(2), and two equivalent Si(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Si(1) atom. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent K(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Si(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted hexagonal planar geometry to two equivalent Mg(3) and four equivalent Mg(1) atoms. Si(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and four equivalent Mg(2) 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(3), four equivalent Mg(2), and two equivalent Si(1) atoms. Both K(1)-Mg(1) bond lengths are 3.66 Å. Both K(1)-Mg(3) bond lengths are 3.43 Å. All K(1)-Mg(2) bond lengths are 3.42 Å. Both K(1)-Si(1) bond lengths are 3.46 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Si(1) atom. Both Mg(1)-Mg(2) bond lengths are 3.16 Å. Both Mg(1)-Mg(3) bond lengths are 3.06 Å. Both Mg(1)-Mg(4) bond lengths are 3.24 Å. The Mg(1)-Si(1) bond length is 2.75 Å. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent K(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Si(1) atoms. The Mg(2)-Mg(3) bond length is 3.25 Å. There is one shorter (3.00 Å) and one longer (3.19 Å) Mg(2)-Mg(2) bond length. Both Mg(2)-Si(1) bond lengths are 2.88 Å. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.16 Å. In the fourth Mg site, Mg(4) is bonded in a distorted hexagonal planar geometry to two equivalent Mg(3) and four equivalent Mg(1) atoms. Si(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and four equivalent Mg(2) atoms.