Corundum

usgb/kəˈrʌndəm/
noun

A hard mineral that is often used as an abrasive or in making rubies and sapphires for jewelery.

Rubies are red due to the presence of chromium in the corundum crystal structure.
Visual representation of "corundum" - A hard mineral that is often used as an abrasive or in making rubies and sapphires for jewelery

Often appears as...

  • corundum grinding wheel
  • corundum crystal structure

Usage tips

Technical

Definition 1 of 1
Visual representation of "corundum"
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Material Strength

Corundum is extremely hard, second only to diamonds, which suggests high durability in its context.

Illustration for Material Strength
Due to its hardness, corundum is used in watch faces.
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Gemstone Color

Corundum forms rubies or sapphires depending on trace elements, indicating its versatility in jewelry.

Illustration for Gemstone Color
While shopping for jewelry, I learned that both rubies and sapphires are actually colored corundum.
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Industrial Usage

Corundum's abrasive qualities mean it's often mentioned in mechanical or industrial contexts.

Illustration for Industrial Usage
They used a corundum-coated disk for cutting the steel.
Visual representation of the word "Corundum"

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