AM_Pyroxene-ideal_119 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 7.559 6.928 4.0 90.0 105.3 90.0 , V=202.05 Space group: P121/C1 (14)

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 low clinopx with, O3A-O3A-O3A angle = 180, O3B-O3B-O3B angle = 120, and model oxygen radius = 1