Question

question 18 (2 points) which is a characteristic of the monoclinic symmetry class: it can have 4 3 -fold rotational axes. a≠b≠c it can have 3 4 -fold rotational axes. it has a uniaxial optical interference figure angles alpha, beta, and gamma are all at 90 degrees

Explanation:

In the monoclinic symmetry class, the lattice parameters are \(a
eq b
eq c\), and the angles \(\alpha=\gamma = 90^{\circ}\), \(\beta
eq90^{\circ}\). Monoclinic crystals do not have 3 or 4 three - fold rotational axes and do not have a uniaxial optical interference figure.

Answer:

\(a
eq b
eq c\)