Corundum is a mineral with a hardness of 9 on the Mohs hardness scale. For which application would corundum most likely be useful?

Corundum has a hardness of 9, so it can scratch and wear down many other materials. That makes it useful as an abrasive for grinding glass; seasoning food, making toothpaste, and creating makeup do not rely on corundum’s exceptional hardness.

AI-written and checked against the verified answer.