* Minerals are naturally occurring: Minerals form through geological processes over long periods. Melted copper is a man-made product.

* Minerals have a specific chemical composition: Copper, in its pure form, is a chemical element. While minerals can be composed of elements, they often have a specific combination of elements and a defined chemical formula. Melted copper is simply copper in a liquid state.

* Minerals have a crystalline structure: Minerals have a specific, ordered arrangement of atoms, forming a crystalline structure. Melted copper is a liquid and lacks this ordered structure.

In summary: Melted copper is simply copper in a molten state, a man-made product resulting from heating. It does not meet the criteria of being a naturally occurring, chemically defined substance with a crystalline structure, which are the defining characteristics of a mineral.