AM_Pyroxene-ideal_107 Formula: Fe Na Si2 O6 Name: Pyroxene-ideal Unit cell: 9.737 9.009 5.201 90.0 109.9 90.0 , V=428.99 Space group: C12/C1 (15)

Thompson R M , Downs R T , American Mineralogist , 89 (2004) p.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