AM_Pyroxene-ideal_7 Formula: Si Mg O3 Name: Pyroxene-ideal Unit cell: 13.063946 6.0 3.4641016 90.0 90.0 90.0 , V=271.53 Space group: P21CA (29)

Thompson R M , Downs R T , American Mineralogist , 88 (2003) p.653-666, Model pyroxenes I: Ideal pyroxene topologies, Pyroxene #7 based on stacking sequence ABABACAC, Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.