AM_Grunerite Formula: (Fe6.1 Mg.9) Si8 O23.5 (F.5 H1.5) Name: Grunerite Unit cell: 9.5642 18.393 5.3388 90.0 101.892 90.0 , V=919.01 Space group: C12/M1 (12)

Finger L W , Mineralogical Society of America Special Paper , 2 (1969) p.95-100, The crystal structure and cation distribution of a grunerite, Locality: Wabush iron formation, Labrador, Canada