AM_Topaz_14 Formula: Al2 Si O4.6 F1.4 H.6 Name: Topaz Unit cell: 4.6696 8.8486 8.3915 90.0 90.0 90.0 , V=346.73 Space group: PBNM (62)

Alberico A , Ferrando S , Ivaldi G , Ferraris G , European Journal of Mineralogy , 15 (2003) p.875-881, X-ray single-crystal structure refinement of an OH-rich topaz from Sulu UHP terrane, (Eastern China) - Structural foundation of the correlation between cell parameters, and fluorine content, Locality: Sulu UHP terrane, Eastern China