AM_Topaz_13 Formula: Al2 Si O6 D2 Name: Topaz Unit cell: 4.6658 8.821 8.2573 90.0 90.0 90.0 , V=339.85 Space group: PBNM (62)

Komatsu K , Kagi H , Marshall W G , Kuribayashi T , Parise J B , Kudoh Y , American Mineralogist , 93 (2008) p.217-227, Pressure dependence of the hydrogen-bond geometry in topaz-OD from neutron, powder diffraction, Locality: synthetic, Sample: 70 tons, P = 7.5 GPa