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 = 50 kb
olivine
_database_code_amcsd 0000552
4.712 9.97 5.955 90 90 90 Pbnm
atom    x    y    z Biso
Si   .428 .101  .25   .7
Mg1     0    0    0   .2
Mg2  .993 .283  .25   .6
O1   .776 .103  .25   .1
O2   .228 .440  .25   .4
O3   .281 .153 .032   .6