AM_Braunite
Formula:
Mn6.68 Mg.13 Ca.01 Fe.18 Si O12
Name:
Braunite
Unit cell:
9.432 9.432 18.703 90.0 90.0 90.0 , V=1663.87
Space group:
I41/ACD (142)
de Villiers J P R , American Mineralogist , 60 (1975) p.1098-1104, The crystal structure of braunite with reference to its solid-solution behavior