Perucca reported that the dyed crystal did exhibit the desired optical rotation.

Above this critical temperature, the crystal is in a nonferroic state and does not exhibit the physical characteristic of interest.

Many crystals are anisotropic to light ("optical anisotropy"), and exhibit properties such as birefringence.

Prior to Terhune's discovery, it was believed that crystals could only exhibit second harmonic generation if the crystal was noncentrosymmetric.

It exists as brown to black crystalline powder, but single crystals are golden and exhibit metallic conductivity.

Its crystals are doubly refracting, and exhibit a banded structure in polarized light.

Crystal habit refers to the shapes that crystals exhibit.

This is analogous to ferromagnetism, in that, in the absence of an electric field during production, the ferroelectric crystal does not exhibit a polarization.

Photonic crystals, like many other known systems, can exhibit unusual propagation behavior such as reversal of phase and group velocities.

Ferroelectric effect - The phenomenon whereby certain ionic crystals may exhibit a spontaneous dipole moment.