AM_Topaz_19 Formula: Al2 Si O6 D2 Name: Topaz Unit cell: 4.7282 8.932 8.4309 90.0 90.0 90.0 , V=356.06 Space group: PBNM (62)

Chen J , Lager G A , Kunz M , Hansen T C , Ulmer P , Acta Crystallographica, Section E , 61 (2005) p.i253-i255, A Rietveld refinement using neutron powder diffraction data of a, fully deuterated topaz, Al2SiO4(OD)2