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 …

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 …

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 …

Jul 2, 2025 · Corundum is a crystalline form of aluminum oxide (Al₂O₃) and one of the hardest naturally occurring minerals, second only to diamond on the Mohs hardness scale.

Corundum is used as an abrasive ("Emery"), and the gem varieties of corundum are better-known as Ruby and Sapphire.

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

Originally synthesized to make rubies, now corundum is synthesized to make lenses for satellites, scratch resistant glass, and other high strength optical materials.

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, an illustrious gemstone species, derives its name from the Tamil word "kurundam," signifying a deep blue or sapphire. As one of the hardest minerals on Earth, corundum has earned its …