Which Major Islands and Minerals of the World term is correctly associated with important identifying fact: “a copper iron sulphide mineral”, and also with “a major ore of copper”?

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