Beryl
Artioli G, Rinaldi R, Stahl K, Zanazzi P F
American Mineralogist 78 (1993) 762-768
Structure refinements of beryl by single-crystal neutron and X-ray diffraction
Sample no. 2, aquamarine, probed with neutrons, T = 295 K
_database_code_amcsd 0001605
9.218 9.218 9.197 90 90 120 P6/mcc
atom      x      y      z  occ Biso
Si    .3872  .1157      0      0.23
Be       .5      0    .25      0.45
Al      2/3    1/3    .25 .985 0.27
Fe      2/3    1/3    .25 .015 0.27
O1    .3098  .2363      0      0.69
O2   .49866 .14541 .14517      0.46
Na        0      0    .25 .016  5.0
OW        0      0    .25  .24  5.0
H         0      0   .165  .13  4.0