AM_Beryl_12 Formula: Si6.009 Be2.898 Li.015 Al1.758 Fe.064 Mg.258 O18.9 Na.243 H.9 Name: Beryl Unit cell: 9.2367 9.2367 9.1903 90.0 90.0 120.0 , V=679.04 Space group: P6/MCC (192)

Aurisicchio C , Fioravanti G , Grubessi O , Zanazzi P F , American Mineralogist , 73 (1988) p.826-837, Reappraisal of the crystal chemistry of beryl, Sample: 24, Note: U(1,2) for Na altered to match symmetry constraints.