Majorite Nakatsuka A, Yoshiasa A, Yamanaka T, Ito E American Mineralogist 84 (1999) 199-202 Structure refinement of birefringent Cr-bearing majorite Mg3(Mg.34Si.34Al.18Cr.14)2Si3O12 _database_code_amcsd 0002087 11.512 11.512 11.515 90 90 90 *I4_1/a .5 .25 .125 atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Si1 .5 .25 .375 .008 .008 .009 0 0 0 Si2 .5 .25 .875 .008 .008 .005 0 0 0 Si3 -.3749 .0001 .7497 .007 .009 .008 .001 0 0 MgX1 .1250 -.0003 .2497 .006 .020 .024 0 .003 .011 MgX2 0 .25 .6246 .019 .023 .005 -.011 0 0 MgY1 .5 0 .5 .34 .006 .004 .003 .001 -.001 0 SiY1 .5 0 .5 .34 .006 .004 .003 .001 -.001 0 AlY1 .5 0 .5 .18 .006 .004 .003 .001 -.001 0 CrY1 .5 0 .5 .14 .006 .004 .003 .001 -.001 0 MgY2 .5 0 0 .34 .004 .005 .006 -.001 -.001 .003 SiY2 .5 0 0 .34 .004 .005 .006 -.001 -.001 .003 AlY2 .5 0 0 .18 .004 .005 .006 -.001 -.001 .003 CrY2 .5 0 0 .14 .004 .005 .006 -.001 -.001 .003 O1 .0331 .0503 .6547 .007 .014 .009 -.001 -.004 .006 O2 .0326 -.0510 .8454 .006 .017 .021 -.003 .006 .012 O3 .2173 .0955 .8000 .006 .010 .019 -.002 .000 -.007 O4 .2172 -.0961 .7000 .007 .013 .014 -.001 .002 -.001 O5 -.0511 .1546 .4679 .016 .014 .008 -.007 .001 .003 O6 -.0951 .1989 .7819 .014 .015 .006 -.002 -.001 .001