Beryl
Aurisicchio C, Fioravanti G, Grubessi O, Zanazzi P F
American Mineralogist 73 (1988) 826-837
Reappraisal of the crystal chemistry of beryl
Sample: 24
Note: U(1,2) for Na altered to match symmetry constraints.
Locality: Morrua, Zambesia
_database_code_amcsd 0001176
9.2367 9.2367 9.1903 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  .3867 .1142     0            .0045  .0045  .0034  .0023      0      0
Be      .5     0   .25 .966 .006
Li      .5     0   .25 .005 .006
Si2     .5     0   .25 .003 .006
Al1     .5     0   .25 .026 .006
Al2    2/3   1/3   .25  .84       .0042  .0042  .0039  .0021      0      0
Fe     2/3   1/3   .25 .032       .0042  .0042  .0039  .0021      0      0
Mg     2/3   1/3   .25 .129       .0042  .0042  .0039  .0021      0      0
O1   .3070 .2332     0            .0122  .0108  .0151  .0090      0      0
O2   .4968 .1442 .1452            .0107  .0094  .0053  .0059 -.0026 -.0004
OH       0     0     0   .9
Na       0     0   .25 .243       .0393  .0393  .0256 .01965      0      0