Lu2Si2O7
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 0003424
6.5240 6.5553 17.7909 83.977 88.074 87.846 P-1
atom      x      y      z  occ  Uiso
Lu1  .54296 .03148 .25839 .961 .0097
Lu2  .81377 .53185 .26105 .972 .0093
Lu3  .61557 .34637 .09551 .967 .0089
Lu4  .12070 .64583 .09097 .906 .0095
Lu5  .43223 .62021 .41313 .970 .0158
Lu6  .13704 .11235 .39622 .969 .0206
Si1   .6551  .1397  .4184      .0100
Si2   .6311  .8232  .0819      .0088
Si3   .1222  .1810  .0614      .0101
Si4   .3385  .5109  .2592      .0093
Si5   .0036  .0412  .2134      .0090
Si6A  .9604  .6024  .4446   .5  .009
Si6B  .9079  .7330  .4440   .5  .010
O1    .2317  .0766  .9895       .012
O2    .4487  .6900  .0520       .015
O3    .9193  .3095  .0321       .010
O4    .2712  .3438  .0876       .008
O5    .7766  .6421  .1244       .011
O6    .5620  .0081  .1292       .013
O7    .0891  .9825  .1257       .008
O8    .8708  .2519  .1913       .012
O9    .1372  .5855  .2129       .011
O10   .5045  .3761  .2147       .008
O11   .8474  .8725  .2496       .007
O12   .1951  .0605  .2660       .013
O13   .4843  .6956  .2796       .013
O14   .7914  .2252  .3450       .030
O15   .2785  .3994  .3405       .021
O16   .7747  .6145  .3856       .023
O17   .4791  .9994  .3863       .009
O18   .1318  .7728  .4089       .016
O19   .8158  .9910  .4675       .022
O20   .5502  .3159  .4667       .010
O21   .1095  .3742  .4684       .036