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 = .0001 GPa _database_code_amcsd 0009026 4.6627 8.8343 8.3867 90 90 90 Pbnm atom x y z Uiso Al .9047 .1309 .0817 .0053 Si .4005 .9409 .25 .0044 O1 .7963 .5321 .25 .0057 O2 .4531 .7559 .25 .0035 O3 .7904 .0108 .9069 .0064 FO .9006 .7533 .0599 .0117