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 | |
| Category | Inosilicates |
| Formula (repeating unit) | K2ZrSi3O9·H2O |
| Strunz classification | 9.DG.25 |
| Crystal system | Orthorhombic |
| Crystal class | Disphenoidal (222) H-M symbol: (222) |
| Space group | P212121 |
| Unit cell | a = 10.2 Å, b = 13.24 Å c = 7.17 Å; Z = 4 |
| Identification | |
| Color | colorless, light yellow |
| Luster | vitreous |
| References | [1] |
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