AM_Pyroxene-ideal_93 Formula: Cr Na Si2 O6 Name: Pyroxene-ideal Unit cell: 9.653 8.944 5.164 90.0 109.6 90.0 , V=420.01 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 Cameron et al. (1973), with O3-O3-O3 angle = 172.0 and model oxygen radius = 1.294