Nenadkevichite
H-M symbol: (2/m 2/m 2/m)
Nenadkevichite is a rare silicate mineral containing niobium with the chemical 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.
References
- Webmineral data
- Mindat with location data
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Simple | |
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Mixed |
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- Aenigmatite
- Grossmanite
- Keilhauite
- Lorenzenite
- Melanite
- Nenadkevichite
- Titanite
- Zircophyllite
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