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 X-rays, T = 295 K
_database_code_amcsd 0001606
9.218 9.218 9.197 90 90 120 P6/mcc
atom      x      y     z  occ Biso
Si   .38735 .11563     0      0.24
Be       .5      0   .25      0.45
Al      2/3    1/3   .25 .985 0.21
Fe      2/3    1/3   .25 .015 0.21
O1    .3099  .2365     0      0.80
O2    .4986  .1454 .1452      0.47
Wat       0      0   .25  .48  8.5