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Mineralpedia Details for Ilmajokite

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Ilmajokite

Ilmajokite

Named for the type and only locality near the Il’majok River in the Kola Peninsula in Russia. Ilmajokite is a rare mineral that occurs only at its type locality “on the walls of cavities in the central natrolite zone of pegmatites in a differentiated alkalic massif.” Associated minerals include sphalerite, halite, mountainite, nahcolite, and aegirine. Ilmajokite is water soluble.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/ilmajokite.pdf

Formula
(Na,Ce,Ba)10Ti5Si14O22(OH)44·nH2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Platy, Granular 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
bright yellow, light yellow 
Streak
white 
Class
Monoclinic 
Hardness
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Ilmajokite from Yubileinaya pegmatite, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia

Ilmajokite
            from Yubileinaya pegmatite, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia

Ilmajokite, a rare titanium silicate, was the first new mineral discoverd from this pegmatite. The coverage is about 4x3mm.

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