AM_Tephroite Formula: Mn1.83 Mg.17 Si O4 Name: Tephroite Unit cell: 4.879 10.589 6.234 90.0 90.0 90.0 , V=322.07 Space group: PBNM (62)

Francis C A , Ribbe P H , American Mineralogist , 65 (1980) p.1263-1269, The forsterite-tephroite series: I. Crystal structure refinements, Sample: Te 91 olivine, Locality: Madagascar