Which one of the following is a mineral of iron?
- Malachite
- Cassiterite
- Pyrolusite
- Magnetite
The Correct Option is D
Solution and Explanation
To determine which of the options is a mineral of iron, let's examine each option:
- Malachite: Malachite is a green mineral that is primarily a basic carbonate of copper, not iron. It is widely known for its ornamental uses and is not an iron ore.
- Cassiterite: This mineral is primarily tin oxide (SnO_2) and is the chief ore of tin. It has no iron content and thus is not an iron mineral.
- Pyrolusite: Pyrolusite is manganese dioxide (MnO_2), not related to iron minerals. It is primarily used in the production of steel and in various chemical processes but is not an ore of iron.
- Magnetite: Magnetite is an iron oxide with the chemical formula Fe_3O_4. It is one of the primary ores of iron and is magnetic, which makes it very distinguishable. It is commonly found in metamorphic and igneous rocks and is used in the iron and steel industry.
Given the explanation above, the correct answer is Magnetite because it is an iron oxide and a significant mineral source of iron.
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