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

This greater density, be it noted, occurs from the difficulty in mixing the corundum or other abrasive grains with the cementing material with entire uniformity throughout the mass.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua