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