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Russellite

Russellite
Category	Tungstate minerals
Chemical formula	(Bio₂)[WO₄]
Identification
Color	yellow-green, yellow
Crystal system	orthorhombic
Mohs Scale hardness	3½
Dispersion	relatively strong
Density	7.33 - 7.37 g/cm³
References	Mindat.org

Russellite is a mineral with the chemical formula (BiO₂)[WO₄].^[1]

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In the orthorhombic crystal system, Russellite is yellow or yellow-green in colour, with a Mohs hardness of 3½.^[1]

Russellite is named for the mineralogist Sir Arthur Russell, and the type locality is the Castle-an-Dinas Mine,^[1] near St Columb Major in Cornwall, where it was found in wolframite.^[2]

References

^ ^a ^b ^c http://www.mindat.org/min-3478.html
^ Embrey, P. G.; Symes, R. F. (1987). "The Mines and Mining", Minerals of Cornwall and Devon. London: British Museum (Natural History), p.54. ISBN 0565009893.