AM_Ilvaite_14 Formula: Ca.98 Mn.74 Fe2.28 Si2 O9 H Name: Ilvaite Unit cell: 13.008 8.865 5.845 90.0 90.0 90.0 , V=674.02 Space group: PNAM (62)

Bonazzi P , Bindi L , American Mineralogist , 87 (2002) p.845-852, Structural properties and heat-induced oxidation-dehydrogenation of, manganoan ilvaite from perda Niedda mine, Sardinia, Italy, Sample: PN6-500, Crystal at room temperature, annealed at 500 C for 48 hrs