Vesuvianite Armbruster T, Gnos E American Mineralogist 85 (2000) 563-569 P4/n and P4nc long-ranged ordering in low-temperature vesuvianites Sample: from N'chwaning II mine, RSA _database_code_amcsd 0002419 15.487 15.487 11.764 90 90 90 P4nc atom x y z occ Biso Si1 .5 0 .0002 .66 Si2a .56994 .20863 -.1293 .53 Si2b -.70928 .06815 .1292 .53 Si3a .40063 .33032 -.6340 .55 Si3b .33580 .40100 .1360 .55 Al1 .2502 .2482 .5008 .61 Al2a .36212 .12802 -.6263 .57 Al2b -.36191 .13014 .1269 .57 Ca1 .5 0 .2507 .88 .80 Na1 .5 0 .2507 .12 .80 Ca2a .43951 .20435 .12082 .740 Ca2b -.43939 .20737 -.62028 .740 Ca3a -.56939 .35056 -.1111 1.137 Ca3b .85241 .06941 .1081 1.137 O1a .5320 .0779 .0860 .67 O1b -.5320 .0777 -.5853 .67 O2a .5927 .1325 -.2215 .73 O2b -.6336 .0891 .2233 .73 O3a .4720 .2003 -.0772 .67 O3b -.4705 .2006 -.4229 .67 O4a .6884 .1439 -.5280 .64 O4b -.6866 .1422 .0299 .64 O5a -.4208 .2368 .1776 .75 O5b .4187 .2322 -.6783 .75 O6a .5222 .3727 .0573 1.04 O6b -.5209 .3647 -.5596 1.04 O7a .1938 .0770 .1782 1.10 O7b -.6939 -.5776 -.1785 1.10 O8a .6603 .3110 -.5663 .68 O8b -.6578 .3099 .0664 .68 O9 .3953 .3939 .2524 .80 O10b 0 0 .1336 1.20 H10b 0 0 .220 2.37 O10a 0 0 -.6373 1.20 O11a .2553 .1866 -.6346 .64 H11a .211 .191 -.706 2.37 O11b -.2555 .1887 .1376 .64 H11b -.259 .220 .201 2.37 MnY'3a .5 .5 .0605 .852 .60 CaX'4a .5 .5 .3522 .852 .97 MgY'3b 0 0 -.048 .148 .39 CaX'4b .5 .5 .148 .148 .98