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

Some of these minerals may very well be our very own corundum, with its trace elements.

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

The typical asteria is the star-sapphire, generally a bluish-grey corundum, milky or opalescent, with a star of six rays.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various