AM_Phenakite_7 Formula: Be2 Si O4 Name: Phenakite Unit cell: 12.4647 12.4647 8.2515 90.0 90.0 120.0 , V=1110.27 Space group: R11-3 (1)

Hazen R M , Finger L W , Physics and Chemistry of Minerals , 14 (1987) p.426-434, High-temperature crystal chemistry of phenakite (Be2SiO4) and, Chrysoberyl (BeAl2O4), Sample: T = 490 C