AM_Beryl_19 Formula: Si6.042 Be2.475 Li.498 Al2 O18 Na.228 Cs.154 Rb.002 Name: Beryl Unit cell: 9.2148 9.2148 9.2318 90.0 90.0 120.0 , V=678.87 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: 22