wolframite


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to wolframite: scheelite, cassiterite, wulfenite

wolframite

(wo͝ol`frəmīt'), reddish-brown to grayish-black lustrous mineral, a tungstate of iron and manganese, (Fe,Mn)Wo4, occurring in crystals of the monoclinic system. It is the chief ore of the metal tungsten. Widely distributed in nature, it is mined in England, Portugal, Bolivia, Myanmar and the Malay Peninsula, S China, Australia, and W United States.

Wolframite

 

a mineral, formula (Fe, Mn) [WO4]; belongs to the isomorphous series whose terminal members are huebnerite, Mn[WO4], and ferberite, Fe[WO4]. It contains 74-76 percent WO3. Characteristic admixtures are MgO, Ta2O5, Nb2O5, ThO2, and Sc2O3. The content of niobium and tantalum is associated with an isomorphous impurity, but more often with very fine inclusions of minerals of the columbite group. It crystallizes in a monoclinic system. Laminar, thick-tabular, prismatic crystals, minute laminar grains, and coarse-grained aggregates are common. Wolframite is brownish black, huebnerite is reddish, and ferberite is black. The luster is bright to diamondlike. Hardness on the mineralogical scale, 5-5.5; density, 6,700 kg/m3 for huebnerite, and 7,500 kg/m3 for ferberite. Wolframite is found in greisens and quartz veins associated with muscovite, topaz, fluorite, beryl, bismuthine, cassiterite, molybdenite, arsenopyrite and, rarely, antimonite. It is sometimes replaced by scheelite. In an oxidation zone, wolframite is partly replaced by tungsten ochers (tungstite) and ferritungstite.

Wolframite is the main ore mineral from which tungsten is obtained. When it contains large amounts of Sc and Ta, they can be extracted as by-products.

REFERENCE

Barabanov, V. F. Mineralogiia vol’framitovykh mestorozhdenii Vostochnogo Zabaikal’ia [vol. 1]. Leningrad, 1961.

wolframite

[′wu̇l·frə‚mīt]
(mineralogy)
(Fe,Mn)WO4 A brownish- or grayish-black mineral occurring in short monoclinic, prismatic, bladed crystals; the most important ore of tungsten. Also known as tobacco jack; wolfram; wolframine.
References in periodicals archive ?
Huge wolframite mineral deposits, the main ore that provides the metal tungsten, were found at Hemerdon in 1916 and mined until 1944.
The deposits are made up of quartz containing casiterite and wolframite, with a usable content of 0.
He then named his original mineral wolframite, after the German wolfrahm.
Tourmalinization of wall rock and the occurrence of scheelite as an ore mineral, along with wolframite, is restricted to Balda.
It also has abundant reserves of silver, copper, zinc, lead, uranium, wolframite, tungsten and molybdenum.
3] is produced through a multi-step alkaline-based leaching process of either scheelite or wolframite concentrates.
Normally they don't bother people unless they have Tunsten or Wolframite.
XRT sensors find applications in sorting scheelite, wolframite, coal, diamonds and iron ore, while inductive sensors can be used to identify sulphide ores.
The DRC is a marginal source of wolframite, supplying
The main ore minerals of tungsten are wolframite (Fe, Mn) W[O.
The law essentially bans the import of gold, columbite-tantalite, cassiterite, wolframite, and their derivatives from the DRC by US-based publicly held companies, enacts strict reporting standards, and implements a new labeling procedure.