Belovitskaya Y V , Pekov I V , Gobechiya E R , Yamnova N A , Kabalov Y K , Chukanov N V , Schneider J , Crystallography Reports , 47 (2002) p.223-228, Crystal structures of two ancylite modifications, Locality: Lovchorrite Mine, Hackman Velley, Khibiny massif, Kola Peninsula, Russia, Sample: Specimen 52