Mineralpedia Details for Vuoriyarvite-K
Vuoriyarvite-K
Named for the type locality at the Vuoriyarvi massif in the Kola Peninsula in Russia. The only other localities for Vuoriyarvite are also in Russia in the Lovozero and Khibiny massifs, also in the Kola Peninsula. It is found at the type locality as a product of the alteration of pyrochlore during hydrothermal dolomitization of carbonatites, and is associated with apatite, strontianite, ewaldite, and sulfides. It appears as white, translucent tabular crystals.
Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)
- Formula
- (K,Na,[ ])12Nb8(Si4O12)4O8ยท12-16H2O
- Crystal System
- Monoclinic
- Crystal Habit
- Tabular
- Cleavage
- None, None, None
- Luster
- Vitreous (Glassy)
- Color
- white
- Streak
- white
- Class
- Monoclinic - Domatic
- Fracture
- Brittle - Uneven
- Hardness
- 4.5
- WebMineral
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- Mindat
- View Vuoriyarvite-K
Vuoriyarvite-K from Flora Mt., Lovozero Massif, Kola Peninsula, Russia
Brown, short, stubby prismatic crystals to about 0.5mm in open cavity of porphyry matrix.
Click thumbnail images for larger view.
