AM_Sphaerobertrandite Formula: Be3 Si O6 H2 Name: Sphaerobertrandite Unit cell: 5.082 4.64 17.696 90.0 106.13 90.0 , V=400.85 Space group: P121/C1 (14)

Pekov I V , Chukanov N V , Larsen A O , Merlino S , Pasero M , Pushcharovsky D Y , Ivaldi G , Zadov A E , Grishin V G , Asheim A , Tafto J , Chistyakova N I , European Journal of Mineralogy , 15 (2003) p.157-166, Sphaerobertrandite, Be3SiO4(OH)2: new data, crystal structure and genesis