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ImOwl
The 4 Major characteristics of a mineral are:
1. It is formed  by natural processes, not man-made.
2. It is inorganic, it's not alive, it will never be.
3. It is a crystalline solid, a definite volume and shape with a repeating structure.
4. It can be an element or compound with a definite chemical composition, made the same each time with and orderly arrangement of atoms. 
To be classified as a mineral, a substance must have the following four characteristics: it most have organic, naturally occurring, solid, and a have a definite chemical composition. A substance must have a ordered internal structure.

organic- never part of living things.
naturally occurring- not man made.
solid-room temperature.
chemical composition- some minerals have same formula repeating patterns