AM_Ferrosilite_4 Formula: Si2 Mg.635 Fe1.332 Ca.032 O6 Name: Ferrosilite Unit cell: 18.429 9.028 5.26 90.0 90.0 90.0 , V=875.14 Space group: PBCA (61)

Smyth J R , American Mineralogist , 58 (1973) p.636-648, An orthopyroxene structure up to 850 C, T = 500 C