Thompson R M, Downs R T
American Mineralogist 89 (2004) 614-628
Model pyroxenes II: Structural variation as a function of tetrahedral rotation
model acmite after Cameron et al. (1973)
with O3-O3-O3 angle = 174.0 and model oxygen radius = 1.302
_database_code_amcsd 0003497
9.737 9.009 5.201 90 109.9 90 C2/c
atom x y z
Fe 0 11/12 1/4
Na 0 .25 1/4
Si .3081 1/12 .2794
O1 .1339 1/12 .1685
O2 .3661 .25 .3315
O3 .3661 .0076 .0587
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