AM_Ilvaite_21 Formula: Ca Fe2.91 Mg.02 Al.05 Mn.02 Si2 O9 H Name: Ilvaite Unit cell: 13.013 8.802 5.857 90.0 90.28 90.0 , V=670.86 Space group: P121/A1 (14)

Carrozzini B , European Journal of Mineralogy , 6 (1994) p.465-479, Crystal structure refinements of ilvaite: new relationships, between chemical composition and crystallographic parameters, Sample: Seriphos X-3.1