Beryl Aurisicchio C, Fioravanti G, Grubessi O, Zanazzi P F American Mineralogist 73 (1988) 826-837 Reappraisal of the crystal chemistry of beryl Sample: S2 Locality: synthetic, flux-fusion _database_code_amcsd 0001186 9.2051 9.2051 9.1953 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) Si .3873 .1157 0 .995 .0045 .0040 .0034 .0021 0 0 Al1 .3873 .1157 0 .005 .0045 .0040 .0034 .0021 0 0 Be .5 0 .25 .99 .005 Al2 .5 0 .25 .01 .005 Al3 2/3 1/3 .25 .974 .0039 .0039 .0032 .00195 0 0 Cr 2/3 1/3 .25 .026 .0039 .0039 .0032 .00195 0 0 O1 .3100 .2366 0 .0105 .0085 .0128 .0072 0 0 O2 .4986 .1456 .1453 .0085 .0064 .0052 .0036 -.0022 -.0006 Na 0 0 .25 .024