AM_Pyroxene-ideal_126 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 18.363 8.867 5.119 90.0 90.0 90.0 , V=833.50 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 after Yang and Ghose (1995) with, O3A-O3A-O3A angle = 158.9, O3B-O3B-O3B angle = 139.3, and model oxygen radius = 1.302