Ruby a mineral or a rock?

Answer 1

Rubies (and sapphires also) are compounds of a crystallized mineral called corundum that consists mostly of aluminum oxide (Al2O3).

Answer 2

The ruby's chemical composition is Al2O3, an aluminum oxide. The red color of a ruby, which is a kind of corundum, comes from chromium in it.

Answer 3

Rubies are an element.These are compounds of a crystallized mineral called corundum that consists mostly of aluminum oxide (Al2O3).

Answer 4

Ruby is a mineral.

Answer 5

Neither. They are mixtures.