Trinepheline Kahlenberg V, Bohm H American Mineralogist 83 (1998) 631-637 Crystal structure of hexagonal trinepheline - A new synthetic NaAlSiO4 modification Locality: synthetic _database_code_amcsd 0002011 9.995 9.995 24.797 90 90 120 P6_1 atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Na1 .0205 -.4352 .0356 .018 .016 .018 .011 -.004 .000 Na2 .4735 -.5579 .0303 .016 .020 .022 .007 .007 -.002 Na3 .5183 -.4426 .1864 .019 .022 .028 .001 .006 -.008 Na4 .0043 -.9851 .0280 .036 .045 .037 .017 -.019 .000 All .3266 -.9020 .0864 .007 .006 .008 .003 -.001 .000 Al2 .8807 -.7544 .0917 .006 .007 .008 .003 .000 -.001 Al3 .8111 -.2920 .0954 .006 .005 .009 .003 -.001 -.001 Al4 .3308 -.3548 .0906 .005 .005 .009 .002 .001 .002 Si1 .2024 -.6964 .1279 .006 .006 .007 .003 .001 .000 Si2 .3637 -.2977 -.0374 .005 .007 .012 .003 .001 .002 Si3 .9122 -.7636 -.0350 .004 .006 .008 .002 -.001 .000 Si4 .1334 -.2218 .1358 .007 .006 .007 .003 .000 -.001 O1 .3137 -.5371 .0967 .011 .006 .020 .003 .005 .004 O2 .0584 -.6637 -.0741 .007 .016 .013 .006 .002 .004 O3 .0281 -.7271 .1362 .007 .014 .012 .006 -.001 -.001 O4 .2765 -.6869 .1869 .010 .022 .008 .010 -.001 -.002 O5 .0581 -.2459 .1950 .012 .016 .011 .000 .002 -.003 O6 .1918 -.8413 .0955 .010 .009 .016 .006 -.002 -.005 O7 .6810 -.4652 .1264 .011 .007 .029 .004 .007 .006 O8 .8617 -.9457 -.0394 .011 .006 .020 .003 -.007 -.002 O9 .9600 -.7096 .0271 .015 .014 .008 .001 .001 .000 O10 .7696 -.7413 -.0507 .016 .022 .036 .015 -.005 -.001 O11 .1799 -.3546 .1262 .009 .009 .017 .005 .003 .002 O12 .5167 -.7515 .0918 .007 .014 .015 .000 -.002 .002 O13 .2881 -.0533 .1303 .009 .006 .011 .001 -.003 .002 O14 .3024 -.3226 .0239 .019 .026 .010 .013 .003 .006 O15 .0045 -.2438 .0920 .006 .012 .011 .005 -.001 -.001 O16 .8212 -.6234 .1086 .007 .007 .030 .004 .004 .000