Phenakite
Hazen R M, Au A Y
Physics and Chemistry of Minerals 13 (1986) 69-78
High-pressure crystal chemistry of phenakite (Be2SiO4)
and bertrandite (Be4Si2O7(OH)2)
Sample: P = 16 kbar
_database_code_amcsd 0007372
12.437 12.437 8.228 90 90 120 R-3
atom     x     y     z Biso
Be1  .1921 .2093 .4154  .81
Be2  .1947 .2123 .0820  .94
Si   .1947 .2116 .7502  .59
O1   .2098 .0885 .7499  .71
O2   .3332 .3332 .7493  .86
O3   .1227 .2098 .9148  .73
O4   .1212 .2090 .5849  .77