Corundum, the name originated in India, is the name of mineralogy. There are three main variants of corundum Al2O3, namely α-Al2O3, β-Al2O3 and γ-Al2O3. Corundum hardness is second only to diamond. Corundum is a kind of sapphire which is formed of crystals of alumina (Al2O3) and is chrome-plated with metallic chromium. It is generally called ruby. Blue or non-colored corundum is generally classified into sapphire. Corundum ranks 9th in the Mohs hardness table. It has a specific gravity of 4.00 and has a lattice structure of hexagonal cylinders. With the hardness of corundum, and relatively cheaper than diamonds, it has become a good material for sandpaper and grinding tools. Corundum has a glass luster and a hardness of 9. The proportion is 3.95-4.10. It is formed under the condition of high temperature aluminum-rich silicon-depleted C, which is mainly related to magmatism, contact metamorphism and regional metamorphism. Corundum is an artificial material made from bauxite as a main raw material through a mining furnace. It can be used as an abrasive and refractory material. The higher purity is white called white corundum, and the brown containing brown sugar is called brown corundum. Corundum is mainly used for advanced abrasive materials, bearing materials for precision watches and precision machinery. A ruby-based artificial crystal as a laser emitting material. Both rubies and sapphires belong to corundum minerals. In addition to the starlight effect, only translucent-transparent and colorful corundum can be used as gemstones. Red is called ruby, while other shades of corundum are collectively called sapphire. The name Corundum originates from India and is a mineralogical name. Ruby and sapphire are called gemstones. Myanmar, Sri Lanka, Thailand, Vietnam and Cambodia are the world's most important suppliers of quality rubies and sapphires. Other producing countries include China, Australia, the United States, and Tanzania.
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