Dy2Si2O7 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 0003422 6.5971 6.6504 18.0582 83.791 88.653 88.498 P-1 atom x y z occ Uiso Dy1 .54669 .03160 .25884 .0077 Dy2 .81887 .52945 .26374 .0082 Dy3 .61495 .34691 .09507 .0067 Dy4 .12017 .65444 .08928 .0098 Dy5 .42509 .62047 .41389 .0152 Dy6 .13288 .11258 .39816 .0187 Si1 .6517 .1347 .4189 .0066 Si2 .6358 .8230 .0801 .0051 Si3 .1232 .1843 .0626 .0069 Si4 .3383 .5108 .2579 .0060 Si5 .0052 .0437 .2138 .0059 Si6A .9552 .6024 .4469 .5 .012 Si6B .8999 .7340 .4436 .5 .009 O1 .2180 .0811 .9909 .012 O2 .4558 .6962 .0475 .009 O3 .9214 .3094 .0356 .012 O4 .2727 .3464 .0864 .008 O5 .7757 .6452 .1244 .011 O6 .5655 .0042 .1264 .010 O7 .0864 .9937 .1264 .006 O8 .8685 .2497 .1938 .011 O9 .1447 .5875 .2103 .010 O10 .5023 .3721 .2159 .008 O11 .8518 .8701 .2472 .008 O12 .1965 .0624 .2655 .011 O13 .4865 .6897 .2808 .008 O14 .7799 .2223 .3451 .013 O15 .2632 .4022 .3383 .019 O16 .7705 .6148 .3867 .027 O17 .4709 .9977 .3871 .010 O18 .1182 .7716 .4118 .021 O19 .8152 .9907 .4673 .026 O20 .5489 .3046 .4668 .012 O21 .1184 .3755 .4726 .031