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White stolzite grains accent rich yellow veins of Hydrokenoelsmoreite microcrystals
Category Oxide minerals
(repeating unit)
Strunz classification 4.DH.15
Crystal system 3C polytype: Isometric
6R polytype: Trigonal
Crystal class 3C polytype: Hexoctahedral (m3m)
6R polytype: Rhombohedral (3)
Color White
Cleavage None
Fracture Splintery
Tenacity Brittle
Mohs scale hardness 3
Luster Adamantine
Streak White
References [1][2][3]

Hydrokenoelsmoreite is a hydrous tungsten oxide mineral with formula □2W2O6(H2O). Hydrokenoelsmoreite is a colorless to white, translucent isometric mineral. It has a Mohs hardness of 3, exhibits no cleavage and has a splintery fracture. It has a vitreous to adamantine luster. It is optically isotropic with an index of refraction of n = 2.24.

It forms from the oxidation of ferberite within granitic pegmatite dykes and in pegmatitic greisen veins. It has a structure based on a defect pyrochlore lattice (A2B2O6O’).

It was first described for an occurrence in Elsmore Hill, New South Wales, Australia from where it takes its name.


  • Williams, P.A., Leverett, P., Sharpe, J.L., Colchester, D.M. (2005): Elsmoreite, cubic WO3•0.5H2O, a new mineral species from Elsmore, New South Wales, Australia. Canadian Mineralogist, 43, 1061-1064
  • American Mineralogist, volume 91, pages 216-224, 2006.

  • Atencio, D., Andrade, M. B., Christy, A. G., Gieré, R., & Kartashov, P. M. (2010). The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48(3), 673-698.doi: 10.3749/canmin.48.3.673