Tm2Si2O7 Fleet M E, Liu X American Mineralogist 89 (2004) 396-404 A new rare earth disilicate (REE2Si2O7: REE = Dy, Tm, Lu; type-L): Evidence for nonquenchable 10 GPa polymorph with silicon in fivefold trigonal bipyramidal coordination? _database_code_amcsd 0003423 6.5499 6.5876 17.8916 83.828 88.368 88.152 P-1 atom x y z occ Uiso Tm1 .54372 .03118 .25872 .980 .0063 Tm2 .81604 .53057 .26274 .991 .0071 Tm3 .61586 .34733 .09585 .985 .0059 Tm4 .12118 .65008 .09028 .971 .0072 Tm5 .42926 .62039 .41346 .984 .0134 Tm6 .13580 .11216 .39754 .991 .0181 Si1 .6548 .1374 .4190 .0057 Si2 .6343 .8231 .0813 .0055 Si3 .1231 .1822 .0621 .0063 Si4 .3375 .5103 .2587 .0051 Si5 .0042 .0423 .2145 .0049 Si6A .9570 .6017 .4456 .5 .006 Si6B .9040 .7332 .4440 .5 .005 O1 .2214 .0779 .9890 .010 O2 .4554 .6923 .0505 .012 O3 .9170 .3108 .0354 .010 O4 .2724 .3463 .0865 .008 O5 .7781 .6458 .1245 .007 O6 .5651 .0093 .1268 .009 O7 .0873 .9875 .1270 .006 O8 .8698 .2519 .1923 .009 O9 .1419 .5880 .2108 .009 O10 .5044 .3721 .2149 .006 O11 .8486 .8711 .2495 .005 O12 .1963 .0605 .2658 .007 O13 .4851 .6949 .2802 .013 O14 .7893 .2254 .3442 .017 O15 .2745 .3989 .3412 .009 O16 .7721 .6162 .3857 .019 O17 .4763 .9992 .3867 .005 O18 .1251 .7757 .4095 .013 O19 .8166 .9895 .4674 .024 O20 .5524 .3075 .4678 .007 O21 .1139 .3725 .4709 .025