AM_Pyroxene-ideal_87 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 6.6332 6.0 3.464 90.0 100.0 90.0 , V=135.77 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 = 120 and model oxygen radius = 1, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience