In which of the following minerals, `Al` is present ?
1. Fluorspar
2. Mica
3. Feldspar
4. Cryolite

Options

A. `1, 2, 3`
B. `1, 2, 4`
C. `2, 3, 4`
D. `1, 2, 3, 4`

Answer

To determine which of the given minerals contain aluminum (Al), we will analyze the chemical formulas of each mineral listed in the options.

1. **Fluorspar**: The chemical formula for Fluorspar is CaF₂ (Calcium Fluoride). This mineral does not contain aluminum.

2. **Mica**: The chemical formula for Mica is KAl₃Si₃O₁₀(OH)₂ (Basic Potassium Aluminum Silicate). This mineral contains aluminum.

3. **Feldspar**: Feldspar is a group of minerals that includes several types, such as:
- KAlSi₃O₈ (Potassium Feldspar)
- NaAlSi₃O₈ (Sodium Feldspar)
- CaAl₂Si₂O₈ (Calcium Feldspar)
All these types of Feldspar contain aluminum.

4. **Cryolite**: The chemical formula for Cryolite is Na₃AlF₆ (Sodium Hexafluoroaluminate). This mineral also contains aluminum.

Now, let's summarize which minerals contain aluminum:
- **Mica**: Contains aluminum.
- **Feldspar**: Contains aluminum.
- **Cryolite**: Contains aluminum.
- **Fluorspar**: Does not contain aluminum.

Thus, the minerals that contain aluminum are **Mica, Feldspar, and Cryolite**.

### Final Answer:
Aluminum is present in **Mica, Feldspar, and Cryolite**.