AM_Ferrosilite_2 Formula: Mg.635 Fe1.332 Ca.032 Si2 O6 Name: Ferrosilite Unit cell: 18.364 8.988 5.238 90.0 90.0 90.0 , V=864.56 Space group: PBCA (61)

Smyth J R , American Mineralogist , 58 (1973) p.636-648, An orthopyroxene structure up to 850 C, T = 175 C, note temperature factors for O1b appear incorrect