corundum , auch: diamond spar

In 1876, the mountain was discovered as a source for Corundum.

He was almost out of corundum when they reached the extension cage.

In its natural state, it is the mineral corundum.

It's technically corundum, but too poor a quality to hold a decent spell.

Commodities such as black granite, corundum, and feldspar are also found.

All other hues of the gem species corundum are called sapphire.

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

The most common form of crystalline aluminium oxide is known as corundum.

It is a silky brown form of corundum.

The latter property is particularly common in gem-quality corundum.

This plant produces corundum for lasers and other applications.

Although blue is the most well known hue, sapphire is any color of corundum except red.

Aluminium forms one stable oxide, known by its mineral name corundum.

It is used in the Verneuil process to produce synthetic corundum.

Then he walked into the extension cage, leaving a trail of colored corundum beads behind him.

And that would be a good stone, not industrial-grade corundum from western North Carolina.

In 1900, mining operations began by the Canada Corundum Company.

Mineral resources include mainly corundum, limestone, granite, peat and so on.

The founders original plan was to sell the mineral corundum to manufacturers in the East for making grinding wheels.

The pouch of corundum was too small.

Engineers to say: Red corundum in bands of crystalline limestone under swamp.

Then he turned a key of corundum and the bird flew around and around.

It is a red crystallized variety of corundum.

Generally, gemstone-quality corundum in all shades of red, including pink, are called rubies.

For example ruby and sapphire have the same chemical composition (both are corundum) but exhibit different colors.