AM_Gillespite_6 Formula: Ba Fe Si4 O10 Name: Gillespite Unit cell: 7.4985 7.3223 7.92 90.0 90.0 90.0 , V=434.86 Space group: P21212 (18)

Hazen R M , Finger L W , American Mineralogist , 68 (1983) p.595-603, High-pressure and high-temperature crystallographic study of the gillespite I-II, phase transition, P = 21 kbar