How many of the following are the minerals of aluminimum?
Magnesite, cryolite, kaolinite, malachite, epsum salt, bauxite, cuprite

Answer

To determine how many of the given substances are minerals of aluminum, we will analyze each option one by one.

1. **Magnesite**: This is a mineral composed of magnesium carbonate (MgCO3). It does not contain aluminum.
**Conclusion**: Not a mineral of aluminum.

2. **Cryolite**: Cryolite is a mineral with the chemical formula Na3AlF6. It is known to be an important ore of aluminum.
**Conclusion**: This is a mineral of aluminum.

3. **Kaolinite**: Kaolinite is a clay mineral with the formula Al2Si2O5(OH)4. It contains aluminum and is used in the production of ceramics and paper.
**Conclusion**: This is a mineral of aluminum.

4. **Malachite**: Malachite is a copper carbonate hydroxide mineral with the formula Cu2CO3(OH)2. It does not contain aluminum.
**Conclusion**: Not a mineral of aluminum.

5. **Epsom Salt**: Epsom salt is magnesium sulfate (MgSO4·7H2O). It does not contain aluminum.
**Conclusion**: Not a mineral of aluminum.

6. **Bauxite**: Bauxite is the primary ore of aluminum, primarily composed of aluminum oxide (Al2O3·2H2O).
**Conclusion**: This is a mineral of aluminum.

7. **Cuprite**: Cuprite is a copper oxide mineral with the formula Cu2O. It does not contain aluminum.
**Conclusion**: Not a mineral of aluminum.

Now, let's summarize the findings:
- Minerals of aluminum identified: Cryolite, Kaolinite, and Bauxite.
- Total minerals of aluminum: 3.

**Final Answer**: There are 3 minerals of aluminum among the given options.