corundum

Example Sentences

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If the quartz can’t scratch the specimen, it might be beryl or corundum, which are harder than quartz.

From Scientific American • Sep. 3, 2021

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

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

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