Britholite-(La) Hughes J M, Mariano A N, Drexler J W Neues Jahrbuch fur Mineralogie, Monatshefte 1992 (1992) 311-319 Crystal structures of synthetic Na-REE-Si oxyapatites, synthetic monoclinic britholite Locality: synthetic _database_code_amcsd 0014862 9.678 9.682 7.1631 90 90 120.04 P2_1 atom x y z occ Biso La1a .33267 .66656 .0057 .607 .22 Na1a .33267 .66656 .0057 .393 .22 La1b .33415 .66678 .5002 .744 1.04 Na1b .33415 .66678 .5002 .256 1.04 La2a -.01493 .23465 .2513 .974 .457 Na2a -.01493 .23465 .2513 .026 .457 La2b .23454 .24954 .7484 .977 .462 Na2b .23454 .24954 .7484 .023 .462 La2c .24944 .01482 .2506 .975 .459 Na2c .24944 .01482 .2506 .025 .459 Si1 .0289 .6287 .25 .35 Si2 .3715 .4004 .248 .33 Si3 .5997 .9708 .252 .37 O1a .8366 .5165 .245 .85 O1b .4821 .3200 .261 .77 O1c .6783 .1623 .243 .88 O2a .4068 .8779 .267 .70 O2b .4704 .5933 .238 .72 O2c .1230 .5304 .267 .73 O3a .6364 .8985 .0618 .39 O3b .6811 .9258 .422 1.0 O3c .2615 .3625 .063 .50 O3d .2443 .3189 .425 .9 O3e .0747 .7546 .083 .9 O3f .1017 .7373 .444 .54 O -.0007 -.0009 .225 .55 1.9 F -.0007 -.0009 .225 .45 1.9