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
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
From his experiments he believes that yellow corundum, or oriental topaz, may have been formed from blue corundum under the influence of radioactive substances present in the soil in which the sapphire was embedded.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" by Various
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