AM_Sapphirine_4 Formula: Mg2.39 Al5.655 Si1.455 O10 Name: Sapphirine Unit cell: 11.286 14.438 9.957 90.0 125.4 90.0 , V=1322.52 Space group: P121/A1 (14)

Higgins J B , Ribbe P H , Contributions to Mineralogy and Petrology , 68 (1979) p.357-368, A neutron and x-ray diffraction study of (Mg-Al)VI and (Si-Al)IV ordering monoclinic sapphirine, Locality: Bekily, Madagasgar, Note: Data from x-ray diffraction, known as sapphirine II