AM_Pyroxene-ideal_94 Formula: Cr Na Si2 O6 Name: Pyroxene-ideal Unit cell: 9.697 8.98 5.184 90.0 109.7 90.0 , V=425.00 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 at 600C after Cameron et al. (1973), with O3-O3-O3 angle = 172.9 and model oxygen radius = 1.299