Which Major Islands and Minerals of the World term is correctly associated with important identifying fact: “a tin oxide mineral with formula SnO2”, and also with “the principal ore of tin”?

Correct Answer: Option D — Cassiterite. Cassiterite is correct because it is a tin oxide mineral with formula SnO2. Cassiterite is also associated with the principal ore of tin. A further identifying fact is that Cassiterite is a tin oxide mineral with formula SnO2. Another useful fact is that Cassiterite is associated with the principal ore of tin. Why the other options are incorrect: Option A — 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 B — Pyrolusite: It is mainly manganese dioxide, MnO2 and is associated with an important ore of manganese; those are the identifying facts of Pyrolusite. Option C — Gypsum: It is used in plaster and cement manufacture and is associated with a hydrated calcium sulphate mineral; those are the identifying facts of Gypsum. Exam Takeaway: Link Cassiterite with “a tin oxide mineral with formula SnO2” and “the principal ore of tin” for quick revision.