Which of the following contains calcium

Options

A. Chalcocite
B. Carnallite
C. Cassiterite
D. Dolomite

Answer

To determine which of the given options contains calcium, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Identify the Options**: We have four options to consider:
- Chalcocite
- Carnalite
- Cassiterite
- Dolomite

2. **Analyze Chalcocite**:
- **Formula**: Chalcocite is a copper ore with the formula Cu₂S (copper(I) sulfide).
- **Elements Present**: It contains copper (Cu) and sulfur (S).
- **Conclusion**: Chalcocite does not contain calcium.

**Hint**: Check the chemical formula for elements present.

3. **Analyze Carnalite**:
- **Formula**: Carnalite is a hydrated mineral with the formula KMgCl₃·6H₂O (potassium magnesium chloride).
- **Elements Present**: It contains potassium (K), magnesium (Mg), chlorine (Cl), and water (H₂O).
- **Conclusion**: Carnalite does not contain calcium.

**Hint**: Look for the presence of calcium in the formula.

4. **Analyze Cassiterite**:
- **Formula**: Cassiterite is tin oxide with the formula SnO₂.
- **Elements Present**: It contains tin (Sn) and oxygen (O).
- **Conclusion**: Cassiterite does not contain calcium.

**Hint**: Identify the elements in the oxide to check for calcium.

5. **Analyze Dolomite**:
- **Formula**: Dolomite is a carbonate mineral with the formula CaMg(CO₃)₂.
- **Elements Present**: It contains calcium (Ca), magnesium (Mg), and carbonate (CO₃).
- **Conclusion**: Dolomite contains calcium.

**Hint**: Look for the presence of calcium in the mineral's formula.

### Final Answer:
The option that contains calcium is **Dolomite**.