AM_Ilvaite Formula: Fe3 Ca Si2 O9 H Name: Ilvaite Unit cell: 13.008 8.784 5.836 90.0 90.21 90.0 , V=666.83 Space group: P121/A1 (14)

Ghose S , Sen Gupta P K , Schlemper E O , American Mineralogist , 70 (1985) p.1248-1252, Electron ordering in ilvaite, a mixed-valence iron, silicate: crystal structure refinement at 138 K, Sample: T = 138 K