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corundum's Usage Examples:

Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al2O3) with trace amounts of elements such as iron.

colored gemstone, a variety of the mineral corundum (aluminium oxide).

Other varieties of gem-quality corundum are called sapphires.

typically seen in workers involved in the smelting of bauxite to produce corundum.

Rubies and sapphires are gem-quality forms of corundum, which.

It largely consists of corundum (aluminium oxide), mixed with other minerals such as the iron-bearing spinels.

The mineralogy of the gem deposits varies widely with, among others, corundum (sapphire, ruby), chrysoberyl, beryl, spinel, topaz, zircon, tourmaline.

Sapphire and ruby are both varieties of the same mineral: corundum.

Yogo sapphires are blue sapphires, a colored variety of corundum, found in Montana, primarily in Yogo Gulch (part of the Little Belt Mountains) in Judith.

For example, corundum (9) is twice as hard as topaz (8), but diamond (10) is four times as hard as corundum.

shell, with properties that are consistent with iron-poor silicates or corundum, extending from around three stellar radii outward.

5 on the Mohs scale of mineral hardness, between corundum (9) and topaz (8).

Ti2O3 adopts the Al2O3 (corundum) structure.

V2O3 has the corundum structure.

The jewels are typically made from the mineral corundum, usually either synthetic sapphire or synthetic ruby.

corundum's Meaning':

very hard mineral used as an abrasive

Synonyms:

emery; alumina; aluminum oxide; mineral; sapphire; corundom; aluminium oxide; ruby;

Antonyms:

organic; achromatic;