AM_Topaz_15
Formula: Al2 Si O4 F2
Name: Topaz
Unit cell: 4.6627 8.8343 8.3867 90.0 90.0 90.0 , V=345.46
Space group: PBNM (62)

Gatta G D , Nestola F , Ballaran T B , Physics and Chemistry of Minerals , 33 (2006) p.235-242, Elastic behaviour and structural evolution, of topaz at high pressure, Locality: Ouro Preto, Minas Gerias, Brazil, Sample: P = .0001 GPa