Which of the following does not contain aluminium?

Options

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

Answer

To determine which of the following options does not contain aluminum, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: The options we need to evaluate are Cryolite, Fluorspar, Feldspar, and Mica.

2. **Analyze Cryolite**:
- Cryolite is a mineral with the chemical formula Na3AlF6.
- It contains sodium (Na), aluminum (Al), and fluorine (F).
- **Conclusion**: Cryolite contains aluminum.

3. **Analyze Fluorspar**:
- Fluorspar is also known as fluorite, with the chemical formula CaF2.
- It consists of calcium (Ca) and fluorine (F) only.
- **Conclusion**: Fluorspar does not contain aluminum.

4. **Analyze Feldspar**:
- Feldspar is a group of minerals that includes various compositions, generally represented as A-T4O8.
- The 'A' can be potassium (K), sodium (Na), or calcium (Ca), and 'T' can be silicon (Si) or aluminum (Al).
- **Conclusion**: Feldspar contains aluminum.

5. **Analyze Mica**:
- Mica has the chemical formula KAl3Si3O10(OH)2, which indicates it is a basic potassium aluminum silicate.
- **Conclusion**: Mica contains aluminum.

6. **Final Conclusion**:
- Among the options analyzed, Fluorspar is the only mineral that does not contain aluminum. Therefore, the answer is **Fluorspar**.

### Answer:
Fluorspar does not contain aluminum.