a very hard mineral, aluminum oxide (Al2O3), commonly used as an abrasive, a natural or synthetic aluminum oxide in crystal form

Formal and Informal Expressions of corundum

In different contexts, you can replace 'corundum' with suitable alternatives. In a more formal setting, 'aluminum oxide' is apt.

corundum: Explore its Definition & Usage

corundum Definition

1a very hard mineral, aluminum oxide (Al2O3), commonly used as an abrasive
2a natural or synthetic aluminum oxide in crystal form

Using corundum: Examples

Take a moment to familiarize yourself with how "corundum" can be used in various situations through the following examples!

Example
Corundum is used in the production of abrasives, refractories, ceramics, and electrical insulators.
Example
The gem varieties of corundum are sapphire and ruby.

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Summary: corundum in Brief

Corundum [kəˈrʌndəm] is a very hard mineral, aluminum oxide (Al2O3), commonly used as an abrasive. It is also used in the production of refractories, ceramics, and electrical insulators. The gem varieties of corundum are sapphire and ruby.