Beryl Aurisicchio C, Fioravanti G, Grubessi O, Zanazzi P F American Mineralogist 73 (1988) 826-837 Reappraisal of the crystal chemistry of beryl Sample: 19 Note: U(1,2) for Na/Cs/Rb altered to match symmetry constraints. Locality: Salinas mine, Minas Gerais, Brazil _database_code_amcsd 0001182 9.2155 9.2155 9.2291 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 .1191 0 .0029 .0029 .0043 .0016 0 0 Be .5 0 .25 .865 .007 Li .5 0 .25 .131 .007 Si2 .5 0 .25 .001 .007 Al1 .5 0 .25 .003 .007 Al2 2/3 1/3 .25 .0032 .0032 .0045 .0016 0 0 O1 .3051 .2348 0 .0104 .0087 .0192 .0075 0 0 O2 .4981 .147 .1447 .0118 .0114 .0100 .0073 -.0057 -.0040 Na 0 0 .25 .239 .0187 .0187 .0162 .00935 0 0 Cs 0 0 .25 .131 .0187 .0187 .0162 .00935 0 0 Rb 0 0 .25 .002 .0187 .0187 .0162 .00935 0 0