Beryl Aurisicchio C, Fioravanti G, Grubessi O, Zanazzi P F American Mineralogist 73 (1988) 826-837 Reappraisal of the crystal chemistry of beryl Sample: 22 Locality: Mawi mine, Nuristan, Afghanistan _database_code_amcsd 0001183 9.2148 9.2148 9.2318 90 90 120 P6/mcc atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Si1 .3894 .1192 0 .0041 .0041 .0026 .0022 0 0 Be .5 0 .25 .825 .007 Li .5 0 .25 .166 .007 Si2 .5 0 .25 .014 .007 Al 2/3 1/3 .25 .999 .0044 .0044 .0030 .0022 0 0 O1 .3049 .2346 0 .0121 .0090 .0200 .0083 0 0 O2 .4983 .1475 .1449 .0142 .0138 .0082 .0090 -.0059 -.0046 Na 0 0 .25 .228 .0247 .0247 .0189 .01235 0 0 Cs 0 0 .25 .154 .0247 .0247 .0189 .01235 0 0 Rb 0 0 .25 .002 .0247 .0247 .0189 .01235 0 0