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.

What is Corundum? 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 …

Corundum, naturally occurring aluminum oxide mineral (Al2O3) that is, after diamond, the hardest known natural substance. Its finer varieties are the gemstones sapphire and ruby (qq.v.), and its …

Detailed description, properties, and locality information guide about the mineral corundum: ruby and sapphire.

Mar 10, 2019 · 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 …

Jul 2, 2025 · In this article, we’ll explore what corundum is, its key properties, and the many ways it’s used in everyday life—from jewelry to industrial applications.

Corundum is a very hard, tough and stable mineral. For all practical purposes, it is the hardest mineral, second only to diamond. It is unaffected by acids and most environments. The name corundum was …

Originating historically in southeast and central Asia, and more recently in eastern Africa, these colored varieties of the mineral corundum have been much sought as gems because of their rarity, color and …

Oct 21, 2024 · Due to natural corundum's popularity and high value, synthetically produced gem corundum has been used as an inexpensive substitute for many years. Corundum is also used as an …

Corundum is a crystalline form of aluminum oxide and a rock -forming mineral. It is naturally clear but can have different colors when impurities are present. It is superior in hardness and therefore useful …