Shomiokitovoe pegmatite body, Umbozero Mine, Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

A very large agpaitic pegmatite body discovered in 1996 on the northern flank of the Umbozero mine on Alluaiv Mt.
Intensely hydrothermally reworked, extremely Na-rich, CO2-rich and relatively Si-rich pegmatite.
Exceptionally large crystals of many minerals are known from the body (for example up to 20 cm long shomiokite-(Y) crystals).

Ref.:
http://webcenter.ru/~minbooks/lov_193.html