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Mineralpedia Details for Gagarinite-(Y)

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Gagarinite-(Y)

Gagarinite-(Y)

Named in honor of the very first Russian cosmonaut, Yuri Alekseevick Gagarin. Gagarinite is a rare mineral that occurs “as disseminations, segregations, and in veins and miarolitic cavities within Na-metasomatized alkalic granites and quartz-syenites.” Localities for this rare mineral include in kazakhstan, Russia, Norway, the United States, and a few others. It decomposes in water with most of the sodium going into solution. It is also weakly magnetic.

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

Formula
NaCaYF6 
Crystal System
Trigonal 
Crystal Habit
Massive 
Cleavage
Fair, None, None 
Luster
Vitreous - Dull 
Color
yellow, cream white, light brown, pink 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle 
Hardness
4.5 
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Gagarinite-(Y) from Verkhnee Espe, Tarbagatai Range, E. Kazakhstan, Russia

Gagarinite-(Y)
            from Verkhnee Espe, Tarbagatai Range, E. Kazakhstan, Russia Tannish yellow, prismatic crystals of Gagarinite - (Y) to over 1cm suspended in pegmatitic matrix. Identified by Dr. Igor Pekov.
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Gagarinite-(Y) from Gjerdingen, Nordmarka, Lunner, Oppland, Norway

Gagarinite-(Y)
            from Gjerdingen, Nordmarka, Lunner, Oppland, Norway

A tiny lustrous pink prismatic hexagonal crystal to about 1mm. Like Gjerdingen, it is found in the Golden Horn Batholith, near Washington Pass, another massive igneous body. The crystals are remarkably similiar. It is named after the Russian cosmonaut, Yuri Alekseyevich Gagarin, the first man in space.

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