A substance is considered a mineral if it meets all of these five characteristics:

1. Naturally Occurring: Minerals are formed by natural processes within the Earth.

2. Inorganic: They are not formed from living organisms.

3. Solid: Minerals are solid at room temperature, with a definite shape and volume.

4. Crystalline Structure: Minerals have a specific, ordered arrangement of atoms that gives them a unique crystal structure.

5. Definite Chemical Composition: Each mineral has a specific chemical formula, meaning it is made up of a specific combination of elements.

In summary:

* Natural

* Inorganic

* Solid

* Crystalline

* Definite Chemical Composition

Let me know if you'd like more information about any of these characteristics!