Corundum is a apparent anatomy of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the by itself bright cellophane materials, but can accept altered colors if algae are present. Cellophane specimens are acclimated as gems, alleged bittersweet if red and padparadscha if pink-orange. All added colors are alleged sapphire, e.g., "green sapphire" for a blooming specimen.
Because of corundum's acerbity (pure corundum is authentic to accept 9.0 Mohs), it can blemish about every added mineral. It is frequently acclimated as an abrasive, on aggregate from sandpaper to ample machines acclimated in machining metals, plastics, and wood. Some emery is a mix of corundum and added substances, and the mix is beneath abrasive, with an boilerplate acerbity abreast 8.0.
Corundum occurs as a mineral in mica schist, gneiss, and some marbles in Metamorphic terranes. It aswell occurs in low silica ablaze syenite and nepheline syenite intrusives. Added occurrences are as masses adjoining to ultramafic intrusives, associated with lamprophyre dikes and as ample crystals in pegmatites.
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