Formula: Ca.96 Mn.56 Mg.01 Fe2.45 Al.01 Si2 O9 H
Name: Ilvaite
Unit cell: 13.009 8.838 5.843 90.0 90.16 90.0 , V=671.79
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: Oridda X-3.4, Note: O(2,1) y-coordinate changed in order to match reported bond lengths