* Minerals are compounds: Most minerals are not composed of a single element, but rather are chemical compounds formed by the bonding of two or more elements in a fixed ratio. For example, quartz (SiO2) is composed of silicon and oxygen, and halite (NaCl) is composed of sodium and chlorine.
* Specific chemical formula: Each mineral has a specific chemical formula that defines the elements and their proportions in its structure. This formula distinguishes one mineral from another.
* Crystalline structure: Minerals have a crystalline structure, meaning their atoms are arranged in a specific, repeating pattern. This internal structure is responsible for the physical properties of the mineral, such as hardness, cleavage, and crystal shape.
Pure elements are substances made up of only one type of atom. Examples include gold (Au), silver (Ag), and diamond (C). While pure elements can occur naturally, they are less common than minerals.
Key differences in summary:
| Feature | Minerals | Pure Elements |
|---|---|---|
| Composition | Chemical compounds | Single element |
| Chemical formula | Specific formula | No formula |
| Structure | Crystalline | Not necessarily crystalline |
While some minerals may be composed of a single element, such as native gold, the majority are chemical compounds with specific formulas and crystalline structures.
