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 = 20 kb
olivine
_database_code_amcsd 0000550
4.743 10.09 5.954 90 90 90 Pbnm
atom    x    y    z Biso
Si   .427 .095  .25  .37
Mg1     0    0    0  .16
Mg2  .992 .277  .25  .37
O1   .771 .092  .25  -.1
O2   .227 .447  .25   .0
O3   .278 .162 .037   .2