AM_Braunite_3 Formula: Mn7 Si O12 Name: Braunite Unit cell: 9.4264 9.4264 18.6962 90.0 90.0 90.0 , V=1661.29 Space group: I41/ACD (142)
Miletich R , Allan D R , Angel R J , Physics and Chemistry of Minerals , 25 (1998) p.183-192, Structural control of polyhedral compression in synthetic braunite,, Mn2+Mn3+6O8SiO4, Sample in air: P = 0.0001 GPa