Tags: Chemical Substance, Mineral.
Nenadkevichite is a rare silicate mineral containing niobium with formula: (NaCa)(NbTi)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.
