Concept:Iron ores are minerals from which iron can be economically extracted. Common iron ores include hematite, magnetite, limonite, and siderite.
Explanation:Among the given options:
- Cinnabar is mercury sulfide (HgS) and is used to obtain mercury, not iron.
- Bauxite is an aluminum ore (Al₂O₃·nH₂O) and not a source of iron.
- Limonite is a hydrated iron oxide (Fe₂O₃·nH₂O) and is considered an important secondary iron ore.
- Pyrite is iron sulfide (FeSâ‚‚), but it is not typically used as an iron ore due to its high sulfur content, which makes it unsuitable for direct iron extraction.
Therefore, only limonite is a true iron ore among the choices.
Answer:Option C – Limonite.