Beryl
Gibbs G V, Breck D W, Meagher E P
Lithos 1 (1968) 275-285
Structural refinement of hydrous and anhydrous synthetic beryl,
Al2(Be3Si6)O18 and emerald, Al1.9Cr0.1(Be3Si6)O18
Note: hydrous emerald
Locality: synthetic
_database_code_amcsd 0019469
9.214 9.214 9.218 90 90 120 P6/mcc
atom     x     y     z occ Biso
Al     2/3   1/3   .25 .95  .48
Cr     2/3   1/3   .25 .05  .48
Be      .5     0   .25      .24
Si   .3872 .1154     0      .09
O1   .3106 .2365     0      .50
O2   .4993 .1456 .1449      .26
Wat      0     0   .25        9