AM_Beryl_27 Formula: Si6 Be3 (Al1.97 Fe.03) O18.48 H.48 Name: Beryl Unit cell: 9.218 9.218 9.197 90.0 90.0 120.0 , V=676.78 Space group: P6/MCC (192)

Artioli G , Rinaldi R , Stahl K , Zanazzi P F , American Mineralogist , 78 (1993) p.762-768, Structure refinements of beryl by single-crystal neutron and X-ray diffraction, Sample no. 2, aquamarine, probed with X-rays, T = 295 K