corundum मीनिंग इन हिंदी

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The latter property is particularly common in gem-quality corundum.
All other hues of the gem species corundum are called sapphire.
In 1900, mining operations began by the Canada Corundum Company.
Topaz and Corundum are pretty hard stones in their own right.
Other varieties of gem-quality corundum are called sapphires.
Some are made entirely of faceted sapphire ( corundum ).
It also occurs as a hydrothermal alteration product of corundum and nepheline.
In 1876, the mountain was discovered as a source for Corundum.
In 2004, over 2 kilograms of corundum were collected.
For those you'd need diamond or corundum blades.

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