Russellite is a bismuth tungstate mineral with the chemical formula Bi2WO6.

Russellite is yellow or yellow-green in color, with a Mohs hardness of 3+1⁄2.

[2] Russellite is named for the mineralogist Sir Arthur Russell, and the type locality is the Castle-an-Dinas Mine,[2] near St Columb Major in Cornwall, where it was found in 1938 in wolframite.

[5] It occurs as a secondary alteration of other bismuth bearing minerals in tin−tungsten hydrothermal ore deposits, pegmatites and greisens.

It typically occurs associated with native bismuth, bismuthinite, bismite, wolframite, ferberite, scheelite, ferritungstite, anthoinite, mpororoite, koechlinite, cassiterite, topaz, muscovite, tourmaline and quartz.