Na(NaMg)Mg5Si8O22(OH)2 Iezzi G, Gatta G D, Kockelmann W, Della Ventura G, Rinaldi R, Schafer W, Piccinini M, Gaillard F American Mineralogist 90 (2004) 695-700 Low-T neutron powder-diffraction and synchrotron-radiation IR study of synthetic amphibole Na(NaMg)Mg5Si8O22(OH)2 Sample: T = 298 K _database_code_amcsd 0003767 9.71887 17.93853 5.26923 90 102.526 90 P2_1/m atom x y z occ Uiso NaA .26338 .25 .07195 .83 .0389 MgA .26338 .25 .07195 .07 .0389 Mg1 -.24026 .33930 .49828 .0111 Mg2 -.25348 .43071 .98116 .0111 Mg3 -.25237 .25 .97893 .0111 Mg4 -.25268 .50848 .48420 .37 .0111 Na4 -.25268 .50848 .48420 .31 .0111 Mg4' -.26475 .52501 .49913 .16 .0111 Na4' -.26475 .52501 .49913 .13 .0111 Si1A .03422 .33480 .25975 .00243 Si1B .53040 .83483 .29506 .00243 Si2A .03285 .42143 .77063 .00243 Si2B .54682 .91992 .80318 .00243 O1A -.13689 .33642 .19974 .00545 O1B .36433 .83681 .21721 .00545 O2A -.13270 .42159 .70449 .00545 O2B .37237 .92224 .74352 .00545 O3A -.14897 .25 .69317 .00545 O3B .35927 .75 .72024 .00545 O4A .11586 .50067 .79981 .00545 O4B .63000 .99316 .76836 .00545 O5A .09732 .36704 .02195 .00545 O5B .59913 .88482 .09577 .00545 O6A .09833 .37993 .53135 .00545 O6B .59665 .85784 .60458 .00545 O7A .08949 .25 .30087 .00545 O7B .58745 .75 .26427 .00545 H1 -.04703 .25 .75663 .71 .0389 D1 -.04703 .25 .75663 .29 .0389 H2 .53670 .25 .21170 .66 .0389 D2 .53670 .25 .21170 .34 .0389