corundum

Example Sentences

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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

For example apatite is about three times harder than fluorite and diamond is three times harder than corundum.

From Textbooks • Jan. 1, 2015

It’s also a bonza industrial abrasive, and clear slices of synthetic corundum are used to make bullet-proof “glass.”

From Scientific American • Apr. 14, 2012

On the Mohs scale, which measures minerals’ hardness from 1 to 10, corundum ranks at 9.

From BusinessWeek • May 31, 2011

Emery, em′ėr-i, n. a very hard mineral, a variety of corundum, used as powder for polishing, &c.—v.t. to rub or coat with emery.—ns.

From Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) by Various