Wolframite
General
Category	Mineral
Chemical formula	(Fe,Mn)WO4
Identification
Color	Black (ferberite) to brown (huebnerite)
Crystal habit	Tabular crystals, sometimse prismatic
Crystal system	Monoclinic 2/m
Cleavage	Perfect 010
Fracture	Uneven to rough
Mohs Scale hardness	4-4.5
Luster	Submetallic to resinous
Refractive index	Opaque
Pleochroism	None
Streak	Black to brown
Specific gravity	7 - 7.5
Fusibility	3 - 4 to magnetic globule
Solubility	Insoluble

Wolframite (Fe,Mn)WO₄, is an iron manganese tungstate mineral that is the intermediate between ferberite (Fe²⁺ rich) and huebernite (Mn²⁺ rich). Along with scheelite, the wolframite series are the most important tungsten ore minerals. Wolframite is found in quartz veins and pegmatites associated with granitic intrusives. Associated minerals include cassiterite, scheelite, bismuth, quartz, pyrite, galena, sphalerite, and arsenopyrite. Image File history File links Metadata No higher resolution available. ... For other uses, see Mineral (disambiguation). ... A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... In mineralogy, shape and size give rise to descriptive terms applied to the typical appearance, or habit of crystals. ... A crystal system is a category of space groups, which characterize symmetry of structures in three dimensions with translational symmetry in three directions, having a discrete class of point groups. ... In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Cleavage, in mineralogy, is the tendency of crystalline materials to split along definite planes, creating smooth surfaces, of which there are several named types: Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes. ... For other uses, see Fracture (disambiguation). ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Lustre (American English: luster) is a description of the way light interacts with the surface of a crystal, rock or mineral. ... The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ... Pleochroism is an optical phenomenon in which grains of a rock appear to be different colors when observed at different angles,under a petrographic microscope. ... The streak (also called powder color) of a mineral is the color of the powder produced when it is dragged across a unweathered surface. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Fusibility is the ease with which a material will melt. ... Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. ... For other uses, see Iron (disambiguation). ... General Name, symbol, number manganese, Mn, 25 Chemical series transition metals Group, period, block 7, 4, d Appearance silvery metallic Standard atomic weight 54. ... The tungstate ion is WO42-. A tungstate (compound) is a compound containing the tungstate ion, or more complicated polymeric ions. ... For other uses, see Mineral (disambiguation). ... Ferberite is a black mineral composed of iron(II) tungstate (tungsten oxide), chemical formula FeWO4. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. ... For other uses, see Tungsten (disambiguation). ... For other uses, see Quartz (disambiguation). ... This article or section does not cite its references or sources. ... For other uses, see granite (disambiguation). ... Pluton redirects here. ... Cassiterite is a tin oxide mineral, SnO2. ... Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. ... General Name, Symbol, Number bismuth, Bi, 83 Chemical series poor metals Group, Period, Block 15, 6, p Appearance lustrous reddish white Atomic mass 208. ... The mineral pyrite, or iron pyrite, is iron sulfide, FeS2. ... For other uses, see Galena (disambiguation). ... Sphalerite sample Another sphalerite sample The unit cell of sphalerite Sphalerite (ZnS) is a gay mineral that is the chief ore of zinc. ... Arsenopyrite is an iron arsenic sulfide (FeAsS). ...

It was historically found in Bohemia, Saxony, and Cornwall. China reportedly has the world's largest supply of tungsten ore with about 60%. Other producers are Portugal, Russia, Australia, Thailand, Korea, Bolivia, and the United States. Flag of Bohemia Bohemia (Czech: ; German: ) is a historical region in central Europe, occupying the western and middle thirds of the Czech Republic. ... Location Time zone CET/CEST (UTC+1/+2) Administration Country NUTS Region DED Capital Dresden Minister-President Georg Milbradt (CDU) Governing parties CDU / SPD Votes in Bundesrat 4 (from 69) Basic statistics Area  18,416 km² (7,110 sq mi) Population 4,252,000 (11/2006)[1]  - Density 231 /km... For other uses, see Cornwall (disambiguation). ... This article is about the Korean civilization. ...

The name comes from German Wolfram for tungsten and provides the chemical symbol, W, for tungsten. For other uses, see Tungsten (disambiguation). ...

Wolframite was highly valued as the main source of the metal tungsten, a strong and dense material with many military uses. In WWII wolframite mines were a strategic asset as the metal was used in munitions. German industrial tools mostly used tungsten carbide. Also, tungsten was used in specialized armor piercing ammunition. This importance has decreased with the increasing use of depleted uranium for many of these applications. For other uses, see Tungsten (disambiguation). ... Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki Tōjō Casualties Military dead: 17,000,000 Civilian dead: 33,000... Depleted uranium storage yard. ...

See also

• List of minerals

Gem animals. ...

References

• Webmineral data
• Mindat.org
• spiritone.com

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Wolframite