Which of the following minerals contain aluminium ?

Options

A. Fluorspar
B. Feldspar
C. Mica
D. Carborundum

Explanation

To determine which minerals contain aluminum, we will analyze each of the given options based on their chemical formulas.

### Step-by-Step Solution:

1. **Analyze Fluorspar:**
- The formula for Fluorspar is \( \text{CaF}_2 \).
- This mineral consists of calcium (Ca) and fluorine (F) only.
- **Conclusion:** Fluorspar does not contain aluminum.

2. **Analyze Feldspar:**
- The general formula for Feldspar is \( \text{M}_{\text{M'}}\text{M'}_4\text{O}_8 \), where M can be sodium (Na), potassium (K), or calcium (Ca), and M' can be silicon (Si) and aluminum (Al).
- In this structure, aluminum is present in a ratio of 3:1 with silicon.
- **Conclusion:** Feldspar contains aluminum.

3. **Analyze Mica:**
- The formula for Mica is \( \text{K}_2\text{O} \cdot 3\text{Al}_2\text{O}_3 \cdot 6\text{SiO}_2 \cdot 2\text{H}_2\text{O} \).
- Here, aluminum is present in the form of \( \text{Al}_2\text{O}_3 \).
- **Conclusion:** Mica contains aluminum.

4. **Analyze Carborundum:**
- The formula for Carborundum is \( \text{SiC} \).
- This mineral consists of silicon (Si) and carbon (C) only.
- **Conclusion:** Carborundum does not contain aluminum.

### Final Answer:
The minerals that contain aluminum are:
- Feldspar
- Mica