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

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

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

From BusinessWeek • May 31, 2011

Star′-stone, a variety of corundum which, when cut in a particular way, exhibits a reflection of light in the form of a star.—adj.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various