AM_Pyroxene-ideal_133 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 9.154 8.981 5.185 90.0 90.0 90.0 , V=426.27 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 after Yang et al. (1999), with O3-O3-O3 angle = 165.9 and model oxygen radius = 1.306, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience