Topaz Gatta G D, Nestola F, Ballaran T B Physics and Chemistry of Minerals 33 (2006) 235-242 Elastic behaviour and structural evolution of topaz at high pressure Locality: Ouro Preto, Minas Gerias, Brazil Sample: P = 8.39 GPa _database_code_amcsd 0009029 4.5841 8.7308 8.2316 90 90 90 Pbnm atom x y z Uiso Al .9069 .1313 .0807 .0041 Si .4016 .9413 .25 .0041 O1 .7882 .5276 .25 .0037 O2 .4490 .7546 .25 .0037 O3 .7845 .0086 .9094 .0037 FO .9075 .7531 .0653 .0112