AM_Ilvaite_27 Formula: Ca Fe2.925 Mn.075 Si2 O9 H Name: Ilvaite Unit cell: 13.0229 8.7977 5.8428 90.0 90.234 90.0 , V=669.41 Space group: P121/A1 (14)

Ghose S , Hewat A W , Marezio M , Physics and Chemistry of Minerals , 11 (1984) p.67-74, A neutron powder diffraction study of the crystal and, magnetic structures of ilvaite from 305 K to 5 K - a mixed, valence iron silicate with an electronic transition, Sample: T = 5 K