AM_Ferroglaucophane
Formula: O24 Si7.92 Al1.902 Fe2.277 Mg1.031 Na1.72 Ca.15
Name: Ferroglaucophane
Unit cell: 9.587 17.832 5.315 90.0 103.47 90.0 , V=883.63
Space group: C12/M1 (12)

Hawthorne F C , The Canadian Mineralogist , 17 (1979) p.1-10, The crystal chemistry of the amphiboles. X. Refinement of the crystal, structure of ferroglaucophane and an ideal polyhedral model for, clinoamphiboles