Yakubivich O V , Pekov I V , Steele I M , Massa W , Chukanov N V , Crystallography Reports , 54 (2009) p.399-412, Alkali metals in beryl and their role in the formation of derivative structural motifs:, Comparative crystal chemistry of vorobyevite and pezzottaite, Locality: Lipovka pegmatite field, Rezh District, Central Urals, Urals Region, Russia, Note: T = 100 K, Note: variety vorobyevite, Note: Coordinates of O1 and O2 corrected by Yakubivich