corundum

Example Sentences

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Diamond defines a hardness of 10 and is actually about four times harder than corundum, which is 9.

From Textbooks • Jan. 1, 2017

The Bronco mane and eyeball were created from orange sapphires while the head features pave-set diamonds and custom-cut corundum blue stone.

From Washington Times • Jun. 12, 2016

This crystalline aluminum mineral is called corundum, and people have been wearing it with pride for thousands of years.

From Scientific American • Apr. 14, 2012

Diamonds are a 10 and almost four times harder than corundum.

From BusinessWeek • May 31, 2011

According to the colour of the corundum the stone is known as sapphire cat’s-eye, ruby cat’s-eye, topaz cat’s-eye, &c.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" by Various