AM_Pyroxene-ideal_35 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 19.899748 6.0 3.4641016 90.0 100.02499 90.0 , V=407.29 Space group: C12/C1 (15)

Thompson R M , Downs R T , American Mineralogist , 88 (2003) p.653-666, Model pyroxenes I: Ideal pyroxene topologies, Pyroxene #24 based on stacking sequence ABACBCABACBC, Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.