Formula: Si Mg O3
Name: Pyroxene-ideal
Unit cell: 6.928203 6.0 3.4641016 90.0 109.47122 90.0 , V=135.76
Space group: P121/C1 (14)

Thompson R M , Downs R T , American Mineralogist , 88 (2003) p.653-666, Model pyroxenes I: Ideal pyroxene topologies, Pyroxene #3b based on stacking sequence ABABCACABCBC. Ideal analogue of low, clinopyroxene., Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.