Topaz-OH Kanzaki M American Mineralogist 95 (2010) 1349-1352 Crystal structure of a new high-pressure polymorph of topaz-OH Locality: synthetic P = 14 GPa, T = 1400 C _database_code_amcsd 0017560 4.72318 8.91480 2.77276 90 90 90 Pbnm atom x y z occ Uiso AlT .5876 .4402 .25 .01 .0163 SiT .5876 .4402 .25 .20 .0163 AlOc1 .5812 .8587 .25 .60 .0213 SiOc1 .5812 .8587 .25 .11 .0213 AlOc2 .579 .6298 .25 .07 .0163 SiOc2 .579 .6298 .25 .01 .0163 O1 .5891 .2482 .25 .66 .0282 OH1 .5891 .2482 .25 .34 .0282 O2 .2365 .5098 .25 .66 .0334 OH2 .2365 .5098 .25 .34 .0334