|Crystal class||Pyramidal (mm2) |
H-M symbol: (mm2)
|Unit cell||a = 5.43 Å, b = 16.43 Å |
c = 5.45 Å; Z = 4
|Crystal habit||Fine-grained, compact, massive|
|Mohs scale hardness||3.5|
|Specific gravity||7.33 - 7.37|
|Optical properties||Biaxial (+)|
|Refractive index||2.17 - 2.51|
Russellite is a bismuth tungstate mineral with the chemical formula Bi2WO6. It crystallizes in the orthorhombic crystal system. Russellite is yellow or yellow-green in color, with a Mohs hardness of 3 1⁄2.
Russellite is named for the mineralogist Sir Arthur Russell, and the type locality is the Castle-an-Dinas Mine, near St Columb Major in Cornwall, where it was found in 1938 in wolframite. 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.
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