English Corundum Cited by user Sophia.chen.ps on 12 May 2024 Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium, and chromium.
English Sapphire Cited by user Jimw338 on 26 Nov 2016 Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide with trace amounts of elements such as iron, titanium, chromium…