Be2Si2O5 crystallizes in the tetragonal P4/mmm space group. Be(1) is bonded to one O(2) and four equivalent O(1) atoms to form distorted corner-sharing BeO5 trigonal bipyramids. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. In the second Si site, Si(2) is bonded in a square co-planar geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Be(1) and two equivalent Si(1) atoms to form a mixture of distorted corner and edge-sharing OBe2Si2 tetrahedra. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Be(1) and four equivalent Si(2) atoms.
Be2Si2O5 crystallizes in the tetragonal P4/mmm space group. Be(1) is bonded to one O(2) and four equivalent O(1) atoms to form distorted corner-sharing BeO5 trigonal bipyramids. The Be(1)-O(2) bond length is 1.68 Å. All Be(1)-O(1) bond lengths are 1.74 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Si(1)-O(1) bond lengths are 2.03 Å. In the second Si site, Si(2) is bonded in a square co-planar geometry to four equivalent O(2) atoms. All Si(2)-O(2) bond lengths are 2.36 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Be(1) and two equivalent Si(1) atoms to form a mixture of distorted corner and edge-sharing OBe2Si2 tetrahedra. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Be(1) and four equivalent Si(2) atoms.