AM_Pyroxene-ideal_81 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 7.394 6.0 3.464 90.0 117.9 90.0 , V=135.81 Space group: C12/C1 (15)

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 with O3-O3-O3 angle = 240 and model oxygen radius = 1, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience