AM_Ferrosilite_1 Formula: Si2 Mg.636 Fe1.331 Ca.032 O6 Name: Ferrosilite Unit cell: 18.337 8.971 5.232 90.0 90.0 90.0 , V=860.67 Space group: PBCA (61)

Smyth J R , American Mineralogist , 58 (1973) p.636-648, An orthopyroxene structure up to 850 C, T = 20 C