Refractory metals
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Refractory metals are a class of metals that are extraordinarily resistant to heat and wear. The expression is mostly used in the context of materials science, metallurgy and engineering. The definiti
Filament of a 200 watt incandescent lightbulb highly magnified
Apollo CSM with the dark rocket nozzle made from niobium-titanium alloy
Tungsten
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Tungsten is a chemical element; it has symbol W and atomic number 74. It is a metal found naturally on Earth almost exclusively in compounds with other elements. It was identified as a distinct elemen
Refractory metals
…differ. The most common definition includes five elements: two of the fifth period (niobium and molybdenum) and three of the sixth period (tantalum, tungsten, and rhenium). They all share some properties, including a melting point above 2000 °C and high hardness at room temperature. They are chemically inert…
Wolfram evaporated crystals and 1cm 3 cube
Tungsten rod with oxidised surface
Wolframite mineral, with a scale in cm
Tungsten mining in Rwanda forms an important part of the country's economy.