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 …

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.

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 …

This Corundum gemstone guide lists qualities of the Corundum gem type, including stone colors, common names, meanings, gemstone hardness and more.

Check out our green corundum selection for the very best in unique or custom, handmade pieces from our gemstones shops.

Corundum Fuchsite: This mix combines green Fuchsite and Corundum, fostering emotional healing and personal growth. Corundum-Muscovite: Brown to yellow Muscovite combines with …

Jan 26, 2018 · The only corundum color not represented in nature is a saturated intense emerald green. However, less intense olive green to teal green stones are often found in basalt-hosted …

Jan 17, 2019 · Green Sapphire is of the Corundum variety, which is an aluminum oxide mineral that occurs in crystals that are prismatic tabular, bipyramidal or rhombohedral. It can also form …

Oct 3, 2022 · Green sapphires tend to have the highest refractive indices, reaching 1.779. The lowest possible value is 1.757 in Sri Lankan blue sapphires. Here are corundum’s properties:

A deep green variety of Corundum from Drachenfels, Königswinter, Siebengebirge, North Rhine-Westphalia, Germany. Chromium-bearing Corundum: An unnecessary name for a Cr-bearing …