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 = 3.14 GPa _database_code_amcsd 0009027 4.6325 8.7938 8.3254 90 90 90 Pbnm atom x y z Uiso Al .9047 .1307 .0816 .0053 Si .4009 .9407 .25 .0041 O1 .7919 .5295 .25 .0044 O2 .4471 .7547 .25 .0057 O3 .7876 .0101 .9080 .0053 FO .9021 .7529 .0625 .0129