AM_Beryl 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: 9.236 9.236 9.246 90.0 90.0 120.0 , V=683.05 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 = 24 deg C, before heating, O2x has been corrected