Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium, and chromium. [3][4] It is a rock -forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7] .

Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al 2 O 3 and a member of the trigonal crystal system.

Jul 1, 2024 · Corundum is a mineral that is primarily composed of aluminum oxide (Al2O3) and is one of the naturally occurring crystalline forms of aluminum oxide. It is a very hard mineral and is commonly used as an abrasive in various industrial applications.

Mar 7, 2025 · corundum, naturally occurring aluminum oxide mineral (Al 2 O 3) that is, after diamond, the hardest known natural substance. Its finer varieties are the gemstones sapphire and ruby (qq.v.), and its mixtures with iron oxides and other minerals are called emery (q.v.).

Corundum is a very hard, tough, and stable mineral. For all practical purposes, it is the hardest mineral after Diamond, making it the second hardest mineral. It is also unaffected by acids and most environments. Translucent brown Corundum …

Corundum is very compact, dense, and lacks gemstone cleavage. It’s also the second hardest natural mineral after diamond. Gem-quality corundum is also quite rare. These factors make both varieties of corundum some of the most highly desired jewelry …

Corundum is a naturally occurring aluminium oxide mineral that is the second hardest natural substance after diamond. The finer types are sapphire and ruby, and its mixtures of iron oxides and other minerals are referred to as emery.

Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present.

Corundum is a mineral species best known for its two popular gemstone varieties, sapphire and ruby. All colors of corundum except red are known as sapphire. The term sapphire, when used without any modifiers, refers to only the blue variety of corundum.

Most commonly refers to a blue gem variety of corundum, but other coloured varieties of corundum are also described as sapphire, except red corundum, which is better known as ruby. The dehydration of diaspore in corundum occurs between 525 and 550 °C, ...