Tungstite

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)

Short description: Hydroxide mineral

Tungstite is a hydrous tungsten oxide mineral with formula: W O₃·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

↑ 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.

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[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.