Wollastonite is type of

Options

A. chain silicate
B. cyclic silicate
C. sheet silicate
D. 3-D silicate

Answer

To determine the type of Wollastonite, we will analyze its chemical formula and compare it with the different types of silicates.

### Step-by-Step Solution:

1. **Identify the Chemical Formula of Wollastonite**:
- Wollastonite has the chemical formula \( \text{Ca}_3\text{Si}_3\text{O}_9 \).

2. **Understand the Structure of Silicates**:
- Silicates are compounds that contain the silicate anion, which is represented as \( \text{SiO}_4^{4-} \). They can be classified into different types based on how these tetrahedra are arranged and bonded together.

3. **Types of Silicates**:
- **Chain Silicates**: These have a general formula of \( \text{SiO}_3^{n-} \), where two oxygen atoms are shared per tetrahedron.
- **Cyclic Silicates**: These have a formula of \( \text{Si}_n\text{O}_{3n} \) (like \( \text{Si}_3\text{O}_9^{6-} \)), where two oxygen atoms are shared to form rings.
- **Sheet Silicates**: These have a general formula of \( \text{Si}_2\text{O}_5^{2-} \) and share three oxygen atoms per tetrahedron.
- **3D Silicates**: These have a three-dimensional structure and share all four oxygen atoms in the tetrahedra.

4. **Analyzing Wollastonite**:
- The formula \( \text{Ca}_3\text{Si}_3\text{O}_9 \) can be analyzed to see how it fits into these categories. It contains three silicon atoms and nine oxygen atoms, which suggests a cyclic arrangement since it can be represented as \( \text{Si}_3\text{O}_9^{6-} \).

5. **Conclusion**:
- Based on the analysis, Wollastonite is classified as a **cyclic silicate** because its formula corresponds to the cyclic silicate formula where silicon and oxygen are arranged in a ring structure.

### Final Answer:
Wollastonite is a type of **cyclic silicate**.