AM_Pyroxene-ideal_130 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 7.037 6.928 4.0 90.0 90.0 90.0 , V=195.01 Space group: PBCN (60)

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 protopyroxene with O3-O3-O3 angle = 180 and model oxygen radius = 1, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience