Pyroxene-ideal
Thompson R M, Downs R T
American Mineralogist 89 (2004) 614-628
Model pyroxenes II: Structural variation as a function of tetrahedral rotation
model ferrosilite at 1.87 GPa after Hugh-Jones et al. (1995)
with O3-O3-O3 angle = 138.3 and model oxygen radius = 1.366
_database_code_amcsd 0003482
9.552 8.844 5.106 90 103.8 90 C2/c
atom     x      y      z
Fe       0  11/12    1/4
Fe       0    .25    1/4
Si   .3101   1/12  .2219
O1   .1298   1/12  .1413
O2   .3702    .25  .3587
O3   .3702  .0550  .9438