AM_Ferrosilite Formula: Si2 Fe1.71 Mg.25 Ca.04 O6 Name: Ferrosilite Unit cell: 18.405 9.0338 5.239 90.0 90.0 90.0 , V=871.07 Space group: PBCA (61)

Burnham C W , Ohashi Y , Hafner S S , Virgo D , American Mineralogist , 56 (1971) p.850-876, Cation distribution and atomic thermal vibrations in an iron-rich orthopyroxene