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

Correct Answer: Option B — Sphalerite. Sphalerite is correct because it is a zinc sulphide mineral. Sphalerite is also associated with the principal ore of zinc. A further identifying fact is that Sphalerite is a zinc sulphide mineral. Another useful fact is that Sphalerite is associated with the principal ore of zinc. Why the other options are incorrect: Option A — 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. Option C — Chromite: It is important for stainless steel and alloy production and is associated with the principal ore of chromium; those are the identifying facts of Chromite. Option D — Pyrolusite: It is mainly manganese dioxide, MnO2 and is associated with an important ore of manganese; those are the identifying facts of Pyrolusite. Exam Takeaway: Link Sphalerite with “a zinc sulphide mineral” and “the principal ore of zinc” for quick revision.