Which Major Islands and Minerals of the World term is correctly associated with location or primary association: “a major ore of copper”, and also with “a copper iron sulphide mineral”?

Correct Answer: Option A — Chalcopyrite. Chalcopyrite is correct because it is a major ore of copper. Chalcopyrite is also associated with a copper iron sulphide mineral. A further identifying fact is that Chalcopyrite is a major ore of copper. Another useful fact is that Chalcopyrite is associated with a copper iron sulphide mineral. Why the other options are incorrect: Option B — Galena: It is the principal ore of lead and is associated with a lead sulphide mineral with formula PbS; those are the identifying facts of Galena. Option C — Sphalerite: It is the principal ore of zinc and is associated with a zinc sulphide mineral; those are the identifying facts of Sphalerite. Option D — Cassiterite: It is the principal ore of tin and is associated with a tin oxide mineral with formula SnO2; those are the identifying facts of Cassiterite. Exam Takeaway: Link Chalcopyrite with “a major ore of copper” and “a copper iron sulphide mineral” for quick revision.