AM_Pyroxene-ideal_115 Formula: Fe Ca Si2 O6 Name: Pyroxene-ideal Unit cell: 9.828 9.142 5.278 90.0 108.4 90.0 , V=449.97 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 hedenbergite after Zhang et al. (1997), with O3-O3-O3 angle = 164.4 and model oxygen radius = 1.332