Question

Iron, copper, and aluminum and all examples of what type of mineral?

Answer 1

Combined minerals.

Explanation:

Minerals occurs in two form combined and native.
Native refers to the minerals of less reactive metal minerals like gold which is found in free elemental state
Combined ores , on the other hand , refers to the minerals of metals which does not occur in free elemental state.
For example iron occurs as haematite which is iron combined with oxygen.

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