Wolframite

Wolframite is a dark rock.

It can look grey or reddish black. This rock is a main source for a metal called tungsten. This metal is very heavy.

We use the metal to make strong tools. It is also used for light bulbs. Some people find this rock in China. China has the most of it in the world. It is a very useful mineral.

Wolframite is a dark mineral. It can look grey or reddish black. This mineral is a main source for tungsten. Tungsten is a very heavy metal. It also has a high melting temperature.

People use tungsten for many things. It makes parts for light bulbs. It is used for armor-piercing tools. It also makes hard machine tools.

Tungsten can act as a catalyst. A catalyst helps make chemical changes happen. This helps make gasoline during oil refining. It also helps clean up harmful gases.

Wolframite is found in quartz veins. It forms in ways tied to hot magma. China has the largest supply of tungsten. They have about 60% of the world supply. Other countries produce it too. These include Russia, Vietnam, and Bolivia. In 2022, the world made 84,000 metric tons of tungsten. The name comes from a German word. It means "wolf's froth." This was because the mineral ate up tin during mining. The name "tungsten" means "heavy stone" in Swedish.

Wolframite is a very special mineral. It is a main source for the metal tungsten. This metal is very heavy and strong. It also has a very high melting temperature.

People use tungsten for many important jobs. It can make parts for electric filaments. It is also used for armor-piercing ammunition. Hard machine tools are often made from tungsten carbide. In the 19th century, people used tungsten salts to dye cotton. They even used them to make fire-retardant costumes for the stage.

This mineral forms in a few different ways. It often forms through magmatic-hydrothermal processes. This means it is linked to hot, liquid rock called magma. It can also form through metamorphic processes. Wolframite is often found in quartz veins. It can also be found in structures called pegmatites. These are often found near granitic rocks.

The mineral can look like a dark grey or reddish black mass. In its pure crystal form, it has a specific shape. This shape is called a monoclinic crystal system. It can also look like long, thin prisms.

People have been studying this mineral for a long time. The name comes from a German term, "wolf rahm." A man named Johan Gottschalk Wallerius used this name in 1747. Before that, Georg Agricola used the name "Lupi spuma" in 1546. This translates to "wolf's froth" or "wolf's cream." People thought the mineral "ate" tin during mining. This was like a wolf eating a sheep. The name tungsten comes from Swedish words. It means "heavy stone" because the metal is so dense.

Many different places in the world have wolframite. China has the largest supply of tungsten ore. They have about 60% of the world's supply. In 2022, the world produced 84,000 metric tons of tungsten. China produced 71,000 of those metric tons. Other producers include Vietnam, Russia, Bolivia, and Rwanda.

The world also has large reserves of tungsten. There are about 3,800,000 metric tons in reserve. China holds 1,800,000 of those metric tons. Other countries with large reserves are Russia, Vietnam, Spain, and Austria.

Today, tungsten does many helpful things in science. It can act as a catalyst. A catalyst is something that helps a chemical reaction happen. Tungsten helps make gasoline during oil refining. It also helps clean up harmful nitrogen oxide gases.

Another use is as a lubricant. A lubricant helps parts move smoothly. Tungsten disulfide is a special lubricant. It can work in very extreme heat. It works well in both air and a vacuum. This makes it very useful for hard jobs.

Wolframite is a vital mineral used to extract the metal tungsten. It is a tungstate mineral composed of iron, manganese, and tungsten. This mineral belongs to a series that acts as an intermediate between two other minerals. These two ends are called ferberite, which is rich in iron, and hübnerite, which is rich in manganese. Along with the mineral scheelite, the wolframite series provides the most important ores for tungsten.

The chemical makeup of wolframite is a solid solution between its two end members. This means the proportions of iron and manganese can change. A sample can range from 100% ferberite to 100% hübnerite. On average, wolframite contains 60.63% tungsten, 9.21% iron, 9.06% manganese, and 21.10% oxygen. In its pure crystal form, it belongs to the monoclinic crystal system. It can appear in prismatic or lamellar habits, which are specific crystal shapes. The ore itself often looks like a dark grey or reddish black mass.

Wolframite forms through specific geological processes involving heat and pressure. It often forms through magmatic-hydrothermal processes. These processes are associated with felsic magmas, which are types of molten rock. It can also form through metamorphic processes, which happen when rocks change due to intense heat or pressure. You can often find wolframite in quartz veins or pegmatites. These are usually found near granitic intrusives, which are large bodies of igneous rock. It is frequently found alongside minerals like cassiterite, bismuth, quartz, and pyrite.

The history of the name wolframite is quite colorful. In 1546, Georg Agricola used the name "Lupi spuma." This translates from Latin to "wolf's froth" or "wolf's cream." Later, in 1747, Johan Gottschalk Wallerius used the German name "wolf rahm." The name likely refers to how the mineral behaves during extraction. During mining, the mineral consumes large amounts of tin. People compared this to a wolf eating a sheep. The chemical symbol W for tungsten comes from the word "wolfram." The name tungsten itself comes from Swedish words meaning "heavy stone."

Tungsten is a very dense and strong metal with a high melting temperature. Because of these traits, it has many important uses. It is used for electric filaments and armor-piercing ammunition. Hard tungsten carbide is used to make machine tools. In the 19th century, tungsten salts were used to dye cotton and make fire-retardant stage costumes.

During World War II, wolframite mines were considered strategic assets for making munitions.

Today, tungsten plays a massive role in global industry and chemistry. It is used as a catalyst, which is a substance that helps chemical reactions happen. For example, a hydrocracking catalyst uses tungsten to improve gasoline yields during hydrocarbon refinement. Another use is a De-NOX catalyst. This helps treat nitrogen oxide emissions by converting them into inert N2 gas. Tungsten is also used as a lubricant. Tungsten disulfide (WS2) has a very low coefficient of friction. It can operate in extreme conditions, such as 583 °C in air or 1316 °C in a vacuum.

The global production and reserves of tungsten are highly concentrated. As of 2022, the world produced 84,000 metric tons of tungsten. China is the leading producer, contributing 71,000 metric tons. Other significant producers include Vietnam, Russia, Bolivia, and Rwanda. The total world reserves are estimated at 3,800,000 metric tons. China holds the largest share of these reserves with 1,800,000 metric tons. Other major reserves are located in Russia, Vietnam, Spain, and Austria. Historically, wolframite was also found in Europe in places like Bohemia, Saxony, and the UK.

While wolframite is useful, its mining has faced ethical challenges. In the Democratic Republic of the Congo, mining practices were linked to the Congo Wars. Because of these issues, wolframite has been considered a conflict mineral. This means the mineral's extraction was tied to unethical or violent situations. Understanding the source of our materials helps us see the full impact of the technology we use every day.