What is "umbite"

n. (context mineralogy English) An inosilicate mineral of potassium, zirconium and titanium

Umbite ( K( Zr, Ti) Si O· HO) is a potassium zirconosilicate mineral found in northern Russia. Named after Lake Umb ( Lake Umbozero), its type locality is Vuonnemiok River Valley, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.