4661 Arctite, Koashva Open Pit, Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast’, Northern Region, Russia

Small, glassy colourless inclusions (fluorescent blue in SW UV) in natrolite. A very rare sodium-calcium-barium phosphate, obtained in 2008 (at some cost!). Ex Raymond Hodgson Collection (4408)