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 Levien and Prewitt (1981)
with O3-O3-O3 angle = 166.4 and model oxygen radius = 1.319
_database_code_amcsd 0003480
9.760 9.071 5.237 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  .1631
O2   .3664    .25  .3369
O3   .3664  .0172  .0351