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Nenadkevichite is a rare
silicate In chemistry, a silicate is any member of a family of polyatomic anions consisting of silicon and oxygen, usually with the general formula , where . The family includes orthosilicate (), metasilicate (), and pyrosilicate (, ). The name is al ...
mineral containing
niobium Niobium is a chemical element with chemical symbol Nb (formerly columbium, Cb) and atomic number 41. It is a light grey, crystalline, and ductile transition metal. Pure niobium has a Mohs hardness rating similar to pure titanium, and it has sim ...
with the chemical formula . It forms brown to yellow to rose colored
orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...
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 A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than and sometimes greater than . Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic com ...
in the Kola Peninsula. In addition it has been reported from Mont Saint-Hilaire, Canada; the Ilimaussaq complex, Greenland;
Windhoek District Windhoek (, , ) is the capital and largest city of Namibia. It is located in central Namibia in the Khomas Highland plateau area, at around above sea level, almost exactly at the country's geographical centre. The population of Windhoek in 202 ...
, Namibia; and Zheltye Vody, Ukraine. It was named after
Konstantin Avtonomovich Nenadkevich The first name Konstantin () is a derivation from the Latin name ''Constantinus'' (Constantine) in some European languages, such as Russian and German. As a Christian given name, it refers to the memory of the Roman emperor Constantine the Great. ...
(1880–1963), Russian mineralogist and geochemist.


References


Webmineral data
Calcium minerals Sodium minerals Niobium minerals Titanium minerals Cyclosilicates Orthorhombic minerals Minerals in space group 55 {{Silicate-mineral-stub