A variable chemical composition is not a characteristic of a mineral, which has a pre-established chemical composition and currently has a crystal structure.
Minerals are natural substances of inorganic origin, generally solid, that have a defined chemical composition.
Some of its characteristics are:
- It is found in nature, that is, it is not manufactured.
- It has a fixed geometric structure, therefore it is solid.
- It is inorganic in nature.
- It has a fixed chemical composition, although, at times, it may contain a polluting substance that modifies its color.
- Luster, hardness and toughness are some of its properties.
Therefore, we can conclude that a variable chemical composition is not a characteristic of a mineral.
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