AM_Pyroxene-ideal_95 Formula: Cr Na Si2 O6 Name: Pyroxene-ideal Unit cell: 9.65 8.937 5.16 90.0 109.7 90.0 , V=418.96 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 kosmochlor after Origlieri et al. (2003), with O3-O3-O3 angle = 172.8 and model oxygen radius = 1.292