AM_Pyroxene-ideal_127 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 18.535 9.024 5.21 90.0 90.0 90.0 , V=871.42 Space group: PBCA (61)

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 orthoenstatite at 1360 K after Yang and Ghose (1995) with, O3A-O3A-O3A angle = 163.0, O3B-O3B-O3B angle = 149.5, and model oxygen radius = 1.317