Name an ore of iron.

Explanation

**Step-by-Step Solution:**

1. **Understanding Ores**: Ores are naturally occurring solid materials from which a metal or valuable mineral can be extracted profitably. In this case, we are looking for ores of iron.

2. **Identifying Ores of Iron**: There are several ores from which iron can be extracted. The most common ones include:
- **Magnetite**: The chemical formula for magnetite is Fe₃O₄.
- **Hematite**: The chemical formula for hematite is Fe₂O₃.
- **Goethite**: The chemical formula for goethite is FeO(OH).
...