Formula: Si Mg O3
Name: Pyroxene-ideal
Unit cell: 6.6332498 6.0 3.4641016 90.0 100.02499 90.0 , V=135.76
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 #4 based on CCP stacking sequence ABCABCABCABC. Ideal analogue of HP-C2/c, pyroxene and eight-coordinaSiEd Mg2-C2/c pyroxene., Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.