Tungsten oxides are used in ceramic glazes and calcium / magnesium tungstates are used widely in fluorescent lighting.

Tungsten is normally used in thermionic electron guns because it has the highest melting point and lowest vapour pressure of all metals, thereby allowing it to be heated for electron emission, and because of its low cost.

Tungsten, also known as wolfram (), is a chemical element with the chemical symbol W and atomic number 74.

Tungsten with minor amounts of impurities is often brittle and hard, making it difficult to work.

Tungsten is the only metal from the third transition series that is known to occur in biomolecules, where it is used in a few species of bacteria.

Tungsten interferes with molybdenum and copper metabolism, and is somewhat toxic to animal life.

The most common formal oxidation state of tungsten is + 6, but it exhibits all oxidation states from − 2 to + 6 .< ref > Tungsten typically combines with oxygen to form the yellow tungstic oxide, WO < sub > 3 </ sub >, which dissolves in aqueous alkaline solutions to form tungstate ions,.

Tungsten is found in the minerals wolframite ( iron-manganese tungstate, ( Fe, Mn ) WO < sub > 4 </ sub >), scheelite ( calcium tungstate, ( CaWO < sub > 4 </ sub >), ferberite ( FeWO < sub > 4 </ sub >) and hübnerite ( MnWO < sub > 4 </ sub >).

Tungsten is extracted from its ores in several stages.

Tungsten is not traded as a futures contract and cannot be tracked on exchanges like the London Metal Exchange.

Tungsten is mainly used in the production of hard materials based on tungsten carbide, one of the hardest carbides, with a melting point of 2770 ° C.

Tungsten, usually alloyed with nickel and iron or cobalt to form heavy alloys, is used in kinetic energy penetrators as an alternative to depleted uranium, in applications where uranium's additional pyrophoric properties are not required ( for example, in ordinary small arms bullets designed to penetrate body armor ).

Tungsten ( IV ) sulfide is a high temperature lubricant and is a component of catalysts for hydrodesulfurization.

Tungsten oxide ( WO < sub > 3 </ sub >) is incorporated into selective catalytic reduction ( SCR ) catalysts found in coal-fired power plants.

Tungsten powder is used as a filler material in plastic composites, which are used as a nontoxic substitute for lead in bullets, shot, and radiation shields.

Tungsten is unique amongst the elements in that it has been the subject of legal proceedings.

The Palm Photos software is available in the Zire 71, Tungsten C, Tungsten E, Tungsten T2, Tungsten T3 and several others.

Tungsten interferes with the formation of cementite, allowing martensite to preferentially form at slower quench rates, resulting in high speed steel.

The Zire 21, released at the same time as the Tungsten T3 and Tungsten E, sported an improved PIM suite ( known as the Palm PIM Plus ), a 126 MHz TI OMAP311 ARM-Compliant Processor, 8MB On-Handheld RAM, and Palm OS 5. 2. 1.

Since then, the Tungsten line has been Palm's " prosumer " line, aimed at business users and hobbyists wanting a higher performance Palm PDA.

Since it was released at the same time as the Tungsten T3, it includes the newer PIM apps and the enhanced " agenda view " for quick viewing of to-do items and upcoming calendar items.

The Tungsten T3 comes with RealPlayer for Palm OS Handhelds ( called RealOne Player for Palm OS Handhelds at the time of its release ) in addition to a 3. 5 mm Stereo Jack, making it a digital music player when used with a Secure Digital ( SD ) flash memory card.

After the " SD Card Patch " was applied in early ( by the user via a firmware patch ) and later ( at the manufacturing stage ) releases of the Tungsten T3, no other criticisms were known to have risen from the Tungsten T3's use.

The Tungsten W ( known as the i710 during its development period, and X420 at the prototype stage ), introduced in February 2003.

Tungsten CThe Tungsten C introduced in April 2003 was, at the time of its release, palmOne's only handheld that allows the user to access the internet wirelessly through 802. 11b Wi-Fi without the use of a card or other external device.

Taking the advice of colleague Barb ( Holly Hunter ), she looks at his Palm Tungsten C and its record of the names and numbers of three ex-girlfriends, a French supermodel ( Josie Moran ), a gynecologist ( Rashida Jones ) and a cook ( Julianne Nicholson ).

The townsite of Tungsten is located at Cantung Mine in the Northwest Territories.

In 1979 it was estimated that there were 506 people living at Tungsten, 200 of which were employees.

By 1986, it was estimated that only 280 people were living at Tungsten.

) ( It is recommended those having earlier versions of the Palm Treo 650 and Tungsten T5 install the NVFS Fix at the earliest possible convenience ).

* Tungsten deposit at Panasqueira Mine, Portugal

Carrock Fell Mine was the only British Tungsten mine outside Cornwall and was operated at various times between 1850 and 1982 when the price of Tungsten was sufficient.

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

Tungsten has also been used in Dense Inert Metal Explosives, which use it as dense powder to reduce collateral damage while increasing the lethality of explosives within a small radius.

The radiation source is often a Tungsten filament ( 300-2500 nm ), a deuterium arc lamp, which is continuous over the ultraviolet region ( 190-400 nm ), Xenon arc lamp, which is continuous from 160-2, 000 nm ; or more recently, light emitting diodes ( LED ) for the visible wavelengths.

This means that the Challenger 2 now has available a new Tungsten FIN and HESH rounds, if and when required, which secures a line of ammunition for its calibre Length 55 rifled main gun, the L30, when required in the future.

The book is named for Sacks's Uncle Dave, owner of a business named Tungstalite, which made incandescent lightbulbs with a tungsten filament, whom Oliver nicknamed Uncle Tungsten.

CTO, which is orange in appearance, will correct a " Daylight " balanced light source ( such as many common HMI bulbs ) to match the color temperature of Tungsten negative, which is typically 3, 200 kelvins.

Like the Tungsten E, the Tungsten T3 came with an enhanced PIM Suite which categorized all appointments and tasks on the Calendar ( formerly Date Book ) screen.

Tungsten T5 owners were encouraged to install the Tungsten T5 1. 1 Update, which addressed the memory inefficiency issues alongside other operating system-level problems.

Tungsten filament bulbs were a sufficient improvement over carbon filaments that the Moore tubes " graduallly disappeared from the market, leaving only short carbon-dioxide tubes in use for color matching, in which they excelled because of their daylight color.

On May 1, 2009 Zack Rusin from Tungsten Graphics added OpenVG state tracker to Mesa 3D, which enables SVG vector graphics to be hardware accelerated by any Gallium3D-based driver.

The 600 was intended for use in precision assembly but was adapted for welding use, particularly Tungsten inert gas welding ( TIG ), which demands high accuracy and immunity from the intense electromagnetic interference that the TIG process creates.

Tungsten is often added to steel melts as ferrotungsten, which can contain up to 80 % tungsten.

Tungsten ore is a rock from which the element tungsten can be economically extracted.