AM_Pyroxene_13 Formula: (Mg.56 Fe.44) Si O3 Name: Pyroxene Unit cell: 18.312 8.917 5.217 90.0 90.0 90.0 , V=851.87 Space group: PBCA (61)

Hazen R M , Finger L W , Ko J , American Mineralogist , 78 (1993) p.1336-1339, Effects of pressure on Mg-Fe ordering in orthopyroxene synthesized at 11.3 GPa, and 1600 C