AM_Pyroxene-ideal_1 Formula: Mg Si O3 Name: Pyroxene-ideal Unit cell: 6.531973 6.0 3.4641016 90.0 90.0 90.0 , V=135.76 Space group: P21CN (33)

Thompson R M , Downs R T , American Mineralogist , 88 (2003) p.653-666, Model pyroxenes I: Ideal pyroxene topologies, Pyroxene #2 based on stacking sequence ABAC. Ideal analogue of protopyroxene,, high-P protopyroxene., Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.