Tungstite

Hydroxide mineral
(repeating unit)WO3·H2OIMA symbolTgs[1]Strunz classification4.FJ.10Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPmnbIdentificationFormula mass249.86 g/molColorYellow, yellowish green/orangeCrystal habitEarthy, pulverulentCleavagePerfect along [001], imperfect along [110]Mohs scale hardness2.5LusterResinous, pearlyStreakYellowDiaphaneityTransparentSpecific gravity5.517Optical propertiesBiaxial (-)Refractive indexnα = 2.090, nβ = 2.240, nγ = 2.260Birefringenceδ = 0.170Dispersionr < v (strong)

Tungstite is a hydrous tungsten oxide mineral with formula: WO3·H2O. It is a secondary mineral formed by the weathering of other tungsten containing minerals. It crystallizes in the orthorhombic system in translucent yellow to yellow green masses. It is clay-like with Mohs hardness of 2.5 and a specific gravity of 5.5.

It was first described in 1868 for an occurrence near Trumbull, Connecticut at the Hubbard Tungsten Mine at Long Hill.

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  • Mindat with location data
  • Webmineral
  • Handbook of mineralogy
Wikimedia Commons has media related to Tungstite.
Wikisource has the text of the 1921 Collier's Encyclopedia article Tungstite.
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