SiO2 - Quartz (beta)

Lattice parameters:
4.9965 5.4546

Radius:
Si 1.1760 (half-distance)
O: 0.6037 (half-distance)

Space group: 180

Wyckoff positions:
Si 6g, x = 0.5
O 12k, x = 0.4147, y = 0.2078, z = 0.1666

Cells: 3 x 3 x 3
Cutoff: Nodes
Polytopes: Neighbours 4

References
1) Y le Page and G Donnay (1976) Acta Crystallographica, B, 32, 2456.
2) http://www.uwgb.edu/dutchs/Petrology/Silica%20Poly.HTM
