Beryl Sherriff B L, Grundy H D, Hartman J S, Hawthorne F C, Cerny P The Canadian Mineralogist 29 (1991) 271-285 The incorporation of alkalis in beryl: multi-nuclear MAS NMR and crystal-structure study Sample: BLM503 Locality: Bernic Lake, Manitoba, Canada _database_code_amcsd 0005260 9.210 9.210 9.230 90 90 120 P6/mcc atom x y z occ Uiso Si .3890 .1185 0 .0042 Be 1/2 0 1/4 .90 .0088 Li 1/2 0 1/4 .10 .0088 Al 2/3 1/3 1/4 .0052 O1 .3060 .2354 0 .0117 O2 .4982 .1469 .1448 .0103 Na 0 0 0 .19 .0217 Li 0 0 0 .32 .0217 Cs 0 0 1/4 .11 .0367