What is the hardness of corundum?
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Considering this, why is corundum so hard?
The extreme hardness makes corundum an excellent abrasive, and when that hardness is found in beautiful crystals, you have the perfect material for cutting gemstones. Natural and synthetic corundum are used in a wide variety of industrial applications because of their toughness, hardness, and chemical stability.
Additionally, what is the texture of corundum? Corundum is an aluminum oxide that commonly forms hexagonal barrel-shaped prisms that taper at both ends or as thin tabular hexagonal plates. It has a hardness of 9 on the Mohs scale, making it one of the most durable commercial gemstones. It has no dominant cleavage and fractures in a conchoidal manner.
Similarly, you may ask, what is the luster of corundum?
Because of corundum's hardness (pure corundum is defined to have 9.0 on the Mohs scale), it can scratch almost every other mineral.
|Mohs scale hardness||9 (defining mineral)|
|Luster||Adamantine to vitreous|
|Diaphaneity||Transparent, translucent to opaque|
What gems are made of corundum?
The Mineral corundum. Corundum is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue.