Emery consists of

Options

A. Impure corundum
B. Impure carborundum
C. Impure graphite
D. Purest form of iron

Answer

To answer the question "What does emery consist of?", we can break down the information provided in the video transcript into a structured solution.

### Step-by-Step Solution:

1. **Definition of Emery**: Emery is a natural mineral that is primarily used as an abrasive material.

**Hint**: Remember that emery is not just any mineral; it has specific uses in industries due to its properties.

2. **Main Component**: The main component of emery is corundum, which is a crystalline form of aluminum oxide (Al2O3).

**Hint**: Think about the chemical composition of corundum and its significance in the context of emery.

3. **Impurities in Emery**: Emery is not pure corundum; it contains impurities. These impurities can include various oxides, such as iron oxides, which contribute to its hardness and abrasive qualities.

**Hint**: Consider how impurities can affect the properties of a mineral like emery.

4. **Summary of Composition**: Therefore, emery consists of:
- Corundum (Al2O3)
- Impurities such as iron oxides and other metal oxides.

**Hint**: When summarizing, focus on both the primary component and the nature of the impurities.

### Final Answer:
Emery consists primarily of corundum (Al2O3) mixed with various impurities, including iron oxides and other metal oxides.