Nenadkevichite

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Nenadkevichite specimen - rock identification

What is Nenadkevichite?

Nenadkevichite is a rare silicate mineral containing niobium with formula: (Na,Ca)(Nb,Ti)Si2O7·2H2O. It forms brown to yellow to rose colored orthorhombic dipyramidal crystals with a dull to earthy luster. It has a Mohs hardness of 5 and a specific gravity of 2.86. It was first reported in 1955 from a nepheline syenite pegmatite in the Kola Peninsula. In addition it has been reported from Mont Saint-Hilaire, Canada; the Ilimaussaq complex, Greenland; Windhoek District, Namibia; and Zheltye Vody, Ukraine. It was named after Konstantin Avtonomovich Nenadkevich (1880–1963), Russian mineralogist and geochemist.

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Nenadkevichite Localities Map

See where Nenadkevichite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview
North ZoneCentral RidgeSouth Basin

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Quick Facts

Physical Properties

Color
Rose-pink, very light pink, light yellow, brown; dark brown due to inclusions
Hardness (Mohs)
5
Density
2.7 g/cm³
Streak
White, very light rose-pink

Chemical Properties

Chemical Formula
(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
Elements
H, Na, Nb, O, Si
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