AM_Beryl_28 Formula: Al2 Be3 Si6 O18.34 H.672 Name: Beryl Unit cell: 9.2099 9.2099 9.1894 90.0 90.0 120.0 , V=675.04 Space group: P6/MCC (192)

Gatta G D , Nestola F , Bromiley G D , Mattauch S , American Mineralogist , 91 (2006) p.29-34, The real topological configuration of the extra-framework content in, alkali-poor beryl: a multi-methodological study, Locality: Shengus, Haramosh Mts, Gilgit, Northern Areas, Pakistan