Forsterite
Hazen R M
American Mineralogist 61 (1976) 1280-1293
Effects of temperature and pressure on the crystal structure of forsterite
T = 23 C P = 40 kb
olivine
_database_code_amcsd 0000551
4.734 10.02 5.940 90 90 90 Pbnm
atom    x    y    z Biso
Si   .426 .093  .25  .45
Mg1     0    0    0  .37
Mg2  .991 .280  .25  .52
O1   .768 .097  .25   .1
O2   .228 .444  .25   .0
O3   .276 .158 .035   .4