AM_Beryl_2 Formula: Be2.58 Li.39 Al2.15 Si5.88 O18.55 Cs.09 K.05 Na.21 Ca.02 Mg.02 Fe.01 H2 Name: Beryl Unit cell: 9.259 9.259 9.264 90.0 90.0 120.0 , V=687.79 Space group: P6/MCC (192)

Brown G E , Mills B A , American Mineralogist , 71 (1986) p.547-556, High-temperature structure and crystal chemistry of hydrous alkali-rich beryl, from the Harding pegmatite, Taos County, New Mexico, Sample: T = 800 deg C