Elastic modulus | Wave propagation axis | Direction of displacements | Polarization type (symmetry) | Piezo-activity |
| [100] | [010] | shear (E) | non-piezo-active |
| [100] | [001] | shear (T) | piezo-active |
| [001] | | shear (T) | non-piezo-active |
| [001] | [001] | longitudinal | piezo-active |