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Mineralpedia Details for Nenadkevichite

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Nenadkevichite

Nenadkevichite

Named in honor of Konstantin Avtonomovich Nenadkevich who was a Russian mineralogist and geochemist for the A.E. Fersman Mineralogical Museum in Moscow, Russia. Nenadkevichite is a rare mineral that occurs “between crystals of microcline in a nartolite-albite-rich pegmatite in nepheline syenite in a differentiated alkalic massif” at its Russian locality in the Lovozero massif, and “in pegmatites, cavities in igneous breccias, hornfels, and marble xenoliths in an intrusive alkalic gabbro-syenite complex at the Mont Saint-Hilaire locality in Canada. Other localities include Greenland and newer localities in China, the United States, and Namibia.

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

Formula
(Na,[ ])8Nb4(Si4O12)2(O,OH)4ยท8H2
Crystal System
Orthorhombic 
Crystal Habit
Bladed, Pseudo Hexagonal, Prismatic 
Cleavage
Indistinct, None, None 
Luster
Earthy (Dull) 
Color
brown, brown, rose, yellow, tan 
Streak
light pink 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
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Nenadkevichite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Nenadkevichite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Yellow flat, tabular, square crystals with rounded sides to 2mm.

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