corundum

Example Sentences

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Corundum is important to the jewelry trade as ruby and sapphire.

From Textbooks • Feb. 14, 2019

Silex Corundum made a motion as of some body flying through space, and looked inquiringly at the travelers.

From Through Space to Mars Or the Longest Journey on Record by Rockwood, Roy

For figures of other combinations see Calcite and Corundum.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

Corundum is a product of contact metamorphism and also a result of direct crystallization from molten magma.

From The Economic Aspect of Geology by Leith, C. K. (Charles Kenneth)

Corundum, ko-run′dum, n. a mineral consisting of mere alumina, yet of great specific gravity—about four times that of water—and second in hardness only to the diamond.

From Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) by Various