Monoclinic crystal has dimension

Options

A. `anebnec,alpha=gamma=90^(@),betane90^(@)`
B. `a=b=candalpha=beta=gamma=90^(@)`
C. `a=bnecandalpha=beta=gamma=90^(@)`
D. `anebnecandalphanebetane gammane90^(@)`

Answer

To solve the question regarding the dimensions of a monoclinic crystal, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Crystal Systems**:
- There are seven crystal systems in crystallography, and one of them is the monoclinic system.

2. **Identifying the Characteristics of Monoclinic Crystals**:
- In a monoclinic crystal system, all three edge lengths (a, b, and c) are different. This means:
- \( a \neq b \neq c \)
- The angles between the edges are also important:
- The angle \( \alpha \) (between edges b and c) and \( \gamma \) (between edges a and b) are equal and not 90 degrees.
- The angle \( \beta \) (between edges a and c) is equal to 90 degrees.

3. **Summarizing the Dimensions**:
- Therefore, the dimensions of a monoclinic crystal can be summarized as:
- Edge lengths: \( a \neq b \neq c \)
- Angles: \( \alpha = \gamma \neq 90^\circ \) and \( \beta = 90^\circ \)

4. **Examples of Monoclinic Crystals**:
- Common examples of monoclinic crystals include sulfur and borax.

5. **Conclusion**:
- Based on the characteristics and definitions, the dimensions of a monoclinic crystal can be stated clearly.

### Final Answer:
The dimensions of a monoclinic crystal are characterized by:
- Edge lengths: \( a \neq b \neq c \)
- Angles: \( \alpha = \gamma \) (not equal to 90°) and \( \beta = 90° \)