Si crystallizes in the orthorhombic Fmmm space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to three equivalent Si(1) and four equivalent Si(2) atoms to form a mixture of distorted corner and edge-sharing SiSi7 trigonal bipyramids. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to four equivalent Si(1) and four equivalent Si(2) atoms.
Si crystallizes in the orthorhombic Fmmm space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to three equivalent Si(1) and four equivalent Si(2) atoms to form a mixture of distorted corner and edge-sharing SiSi7 trigonal bipyramids. There is one shorter (2.42 Å) and two longer (2.43 Å) Si(1)-Si(1) bond lengths. There are two shorter (2.51 Å) and two longer (2.87 Å) Si(1)-Si(2) bond lengths. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to four equivalent Si(1) and four equivalent Si(2) atoms. There are two shorter (2.48 Å) and two longer (2.72 Å) Si(2)-Si(2) bond lengths.