AM_Beryl_29 Formula: Si5.958 Be2.613 Li.436 Al2 O18.66 Na.313 K.033 Rb.006 Ca.003 Cs.134 H2 Name: Beryl Unit cell: 9.212 9.212 9.236 90.0 90.0 120.0 , V=678.77 Space group: P6/MCC (192)

Hawthorne F C , Cerny P , The Canadian Mineralogist , 15 (1977) p.414-421, The alkali-metal positions in Cs-Li beryl