Discuss the rocks and minerals used in the abrasive industry.

The abrasive industry plays a crucial role in a wide range of applications, including grinding, polishing, and cutting, relying on various rocks and minerals for their hardness, durability, and specific physical properties. Abrasive materials can be either natural or synthetic, with natural abrasives being derived from rocks and minerals found in the Earth's crust. These materials are commonly used in tools such as sandpapers, grinding wheels, and polishing compounds. The key minerals used in the abrasive industry include corundum, garnet, silica, diamond, and others.

Corundum is one of the most important natural abrasives. It is an aluminum oxide mineral (Al₂O₃) that forms in high-temperature metamorphic conditions. Corundum is _________ ________ ___ ______ ______ _____ __________ ________ _________ _________ ______.
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