AM_Topaz_12 Formula: Al2 Si O6 D2 Name: Topaz Unit cell: 4.6755 8.841 8.2823 90.0 90.0 90.0 , V=342.36 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: 58 tons, P = 6.2 GPa