AM_Pyroxene-ideal_86 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 7.023 6.51 3.759 90.0 104.1 90.0 , V=166.68 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 = 140 and model oxygen radius = 1, Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience