AM_Pyroxene-ideal_125 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 14.074 6.928 4.0 90.0 90.0 90.0 , V=390.02 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 orthopx with, O3A-O3A-O3A angle = 180, O3B-O3B-O3B angle = 180, and model oxygen radius = 1, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience