AM_Beryl_21 Formula: Si5.97 Al2.02 Be2.97 Fe.04 O18 Na.047 Name: Beryl Unit cell: 9.2077 9.2077 9.1953 90.0 90.0 120.0 , V=675.15 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: S1