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About: Nenadkevichite     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatPotassiumMinerals, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingdul:ChemicalObjectchemical substanceMineralmineralyago:WikicatCalciumMineralsyago:WikicatTitaniumMineralsyago:WikicatNiobiumMineralsyago:WikicatOrthorhombicMineralsyago:WikicatSodiumMineralsyago:Abstraction100002137yago:Material114580897yago:Matter100020827yago:Mineral114662574yago:Part113809207yago:PhysicalEntity100001930yago:Relation100031921yago:Substance100019613yago:WikicatPotassiumMinerals New Facet based on Instances of this Class

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; , Namibia; and , Ukraine. It was named after (1880–1963), Russian mineralogist and geochemist.