Gemstones:
* Ruby: Red corundum, prized for its vibrant color and brilliance.
* Sapphire: Blue corundum, known for its beautiful, intense blue hues.
* Other colored corundum: Pink, yellow, green, and orange corundum are also found, though less common.
Industrial Applications:
* Abrasives: Corundum is a key ingredient in sandpaper, grinding wheels, and other abrasive tools due to its hardness and durability.
* Ceramics: Used in high-temperature ceramics like furnace linings and spark plug insulators.
* Refractory Materials: Corundum's high melting point makes it suitable for lining furnaces and other high-heat applications.
* Optical Equipment: Used in lasers and other optical equipment due to its high refractive index and transparency.
* Watches: Some high-end watches feature sapphire crystal faces for their scratch resistance.
Other Products:
* Medical Instruments: Corundum's biocompatibility allows its use in medical instruments like bone screws and dental implants.
* Cosmetics: Corundum powder is sometimes used as a mild abrasive in cosmetics.
* Pigments: Corundum is used to create pigments for paints and inks.
This is not an exhaustive list, but it gives you a good idea of the diverse applications of corundum. Its hardness, durability, and other properties make it a valuable material in many industries.
