AM_Ilvaite_30 Formula: Ca (Fe2.75 Mn.25) Si2 O9 H Name: Ilvaite Unit cell: 13.0207 8.8121 5.8609 90.0 90.249 90.0 , V=672.47 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 = 305 K