AM_Gillespite_5 Formula: Ba Fe Si4 O10 Name: Gillespite Unit cell: 7.492 7.492 15.943 90.0 90.0 90.0 , V=894.88 Space group: P4/NCC (130)

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 = 9 kbar