CoachA mineral is an isotropic mineral when its refractive index is the same for every direction of propagation and of vibration of light; cubic minerals (garnet, halite, spinel) and glasses are isotropic. It is an anisotropic mineral when its refractive index depends on the vibration direction; all minerals of the other crystal systems are anisotropic.
Earth and Space Sciences · Glossary
What is Isotropic and anisotropic minerals?
Also known as: isotropic mineral · anisotropic mineral