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 diopside after Cameron et al. (1973)
with O3-O3-O3 angle = 166.4 and model oxygen radius = 1.318
_database_code_amcsd 0003478
9.756 9.067 5.235 90 108.7 90 C2/c
atom     x      y      z
Mg       0  11/12    1/4
Ca       0    .25    1/4
Si   .3082   1/12  .2676
O1   .1335   1/12  .1632
O2   .3665    .25  .3368
O3   .3665  .0172  .0352