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 at 1000C after Cameron et al. (1973)
with O3-O3-O3 angle = 168.5 and model oxygen radius = 1.330
_database_code_amcsd 0003479
9.876 9.170 5.294 90 109.0 90 C2/c
atom     x      y      z
Mg       0  11/12    1/4
Ca       0    .25    1/4
Si   .3082   1/12  .2709
O1   .1337   1/12  .1647
O2   .3663    .25  .3353
O3   .3663  .0145  .0419