AM_Pyroxene-ideal_131 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 9.268 9.102 5.255 90.0 90.0 90.0 , V=443.30 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 protoenstatite at 1360 K after Yang and Ghose (1995), with O3-O3-O3 angle = 168.4 and model oxygen radius = 1.321, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience