* Naturally occurring: Pure metals are often found in nature, but they're typically not in their pure form. They're usually combined with other elements in compounds (ores) like iron oxide (hematite) or aluminum oxide (corundum).
* Inorganic: This is not an issue for pure metals. They are indeed inorganic substances.
* Solid: This is generally true for pure metals at room temperature.
* Definite chemical composition: This is where the issue lies. Pure metals have a fixed chemical composition, but they aren't formed through natural geological processes that result in a specific crystal structure.
* Ordered internal structure: Minerals have an ordered, repeating arrangement of atoms in a crystal lattice. Pure metals can have a crystalline structure, but they often form in a non-crystalline (amorphous) state, especially when produced by humans.
In essence, pure metals lack the specific formation process and crystalline structure required to be classified as minerals. They are usually obtained through industrial processes like mining and refining, not through natural geological events.
Examples:
* Gold (Au): Found in nature as nuggets or in ores, but pure gold is refined from these sources.
* Silver (Ag): Often mined as silver sulfide (argentite), but pure silver is extracted through processing.
* Iron (Fe): Found in ores like hematite, but pure iron is produced in blast furnaces.
While these are examples of pure metals not being minerals, some native elements, like gold and copper, are considered minerals in their naturally occurring forms. However, the bulk of pure metals produced by humans do not meet the full definition of a mineral.
