Here's a breakdown of the key terms:

* Naturally occurring: Minerals form through geological processes, not in a lab.

* Inorganic: Minerals are not made of living organisms or their remains.

* Solid: Minerals have a definite shape and volume.

* Crystal structure: Minerals have a repeating, ordered arrangement of atoms.

* Characteristic chemical composition: Each mineral has a specific chemical formula.

Let me know if you have any other questions about minerals!