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 = 49.5 kbar
_database_code_amcsd 0007374
12.370 12.370 8.188 90 90 120 R-3
atom     x     y     z Biso
Be1  .1924 .2096 .4156  .87
Be2  .1932 .2121 .0842  .94
Si   .1950 .2118 .7496  .49
O1   .2095 .0888 .7508  .70
O2   .3334 .3336 .7500  .79
O3   .1219 .2098 .9151  .69
O4   .1224 .2094 .5840  .68