Which one of the following is not a sulphide ore ?

Options

A. Galena
B. Iron pyrites
C. Magnetite
D. Copper glance

Explanation

To determine which of the following is not a sulphide ore, we will analyze each option provided:

1. **Galena**:
- Galena is known as lead sulfide, with the chemical formula PbS.
- Since it contains sulfur, it is classified as a sulphide ore.

2. **Iron Pyrites**:
- Iron pyrites, also known as fool's gold, has the chemical formula FeS2.
- It contains sulfur, thus it is also classified as a sulphide ore.

3. **Magnetite**:
- Magnetite has the chemical formula Fe3O4.
- This compound does not contain sulfur, so it is not classified as a sulphide ore.

4. **Copper Glance**:
- Copper glance, also known as chalcopyrite, has the chemical formula Cu2S.
- It contains sulfur and is classified as a sulphide ore.

Based on this analysis, the option that is not a sulphide ore is **Magnetite (Fe3O4)**.

### Final Answer:
**Magnetite** is not a sulphide ore.