Umbite

Umbite (K2(Zr,Ti)Si3O9·H2O) 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.[2][3]

Umbite
Pinkish white crystals of the rare zirconium mineral umbite named after the Lake Umb, 20 km east of the type occurrence in Vuonnemiok River Valley (Khibiny Massif, Murmansk Oblast, Russian Federation.
General
CategoryInosilicates
Formula
(repeating unit)		K2ZrSi3O9·H2O
Strunz classification9.DG.25
Crystal systemOrthorhombic
Crystal classDisphenoidal (222)
H-M symbol: (222)
Space groupP212121
Unit cella = 10.2 Å, b = 13.24 Å
c = 7.17 Å; Z = 4
Identification
Colorcolorless, light yellow
Lustervitreous
References[1]

References
  1. Mindat
  2. Webmineral.com - Umbite
  3. Handbook of Mineralogy (HOM - MSA) - Umbite
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