AM_Pyroxene_14 Formula: Mg.016 Al1.388 Fe.162 Ca.742 Si1.5 O6 Name: Pyroxene Unit cell: 9.719 8.814 5.305 90.0 106.04 90.0 , V=436.75 Space group: C12/C1 (15)

Okui M , Sawada H , Marumo F , Physics and Chemistry of Minerals , 25 (1998) p.318-322, Structure refinement of a nonstoichiometric pyroxene synthesized, under ambient pressure