Phenakite
Hazen R M, Finger L W
Physics and Chemistry of Minerals 14 (1987) 426-434
High-temperature crystal chemistry of phenakite (Be2SiO4) and
Chrysoberyl (BeAl2O4)
Sample: T = 490 C
_database_code_amcsd 0007441
12.4647 12.4647 8.2515 90 90 120 R-3
atom      x      y      z Biso
Be1  .19445 .21063 .41563  .88
Be2  .19380 .21103 .08446  .86
Si   .19546 .21158 .74992  .52
O1   .20996 .08869 .75036  .80
O2   .33341 .33297 .74979  .72
O3   .12248 .20986 .91459  .78
O4   .12233 .20871 .58547  .78