* Naturally occurring: Oxygen exists naturally, but it is primarily a gas in the atmosphere, not a solid with a defined crystal structure.
* Inorganic: Oxygen is a pure element, not a compound formed from multiple elements.
* Solid: Oxygen is a gas at standard temperatures and pressures. It only becomes solid at very low temperatures.
* Definite chemical composition: While oxygen has a definite chemical composition (O2), it doesn't form a solid with a specific crystal structure.
* Ordered internal structure: Minerals have a specific, repeating arrangement of atoms (crystal structure). Oxygen in its gaseous state lacks this ordered structure.
Therefore, oxygen is classified as a chemical element and not a mineral.
