Tungstite

Short description: Hydroxide mineral

Tungstite

Bright yellow tungstite on ferberite

General
Category| Mineral
Formula
(repeating unit)| WO3·H2O
Strunz classification| 4.FJ.10
Crystal system| Orthorhombic
Crystal class| Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group| Pmnb
Identification
Formula mass| 249.86 g/mol
Color| Yellow, yellowish green/orange
Crystal habit| Earthy, pulverulent
Cleavage| Perfect along [001], imperfect along [110]
Mohs scale hardness| 2.5
|re|er}}| Resinous, pearly
Streak| Yellow
Diaphaneity| Transparent
Specific gravity| 5.517
Optical properties| Biaxial (-)
Refractive index| nα = 2.090, nβ = 2.240, nγ = 2.260
Birefringence| δ = 0.170
Dispersion| r < 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. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.

* Mindat with location data
* Webmineral
* Handbook of mineralogy

| Wikisource has the text of the 1921 Collier's Encyclopedia article Tungstite.

|

* v
* t
* e

Tungsten minerals

* Hydrokenoelsmoreite
* Ferberite
* Hübnerite
* Raspite
* Russellite
* Scheelite
* Stolzite
* Tungstite
* Wolframite

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Tungstite. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Tungstite&oldid=2352000"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template