AM_Beryl_32 Formula: Si6 Be2.7 Li.62 Al2 O18 Na.19 Cs.11 Name: Beryl Unit cell: 9.21 9.21 9.23 90.0 90.0 120.0 , V=678.03 Space group: P6/MCC (192)

Sherriff B L , Grundy H D , Hartman J S , Hawthorne F C , Cerny P , The Canadian Mineralogist , 29 (1991) p.271-285, The incorporation of alkalis in beryl: multi-nuclear MAS NMR, and crystal-structure study, Sample: BLM503, Locality: Bernic Lake, Manitoba, Canada