Nenadkevichite
A variety of Minerals

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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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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