= Pfeiffer effect
{wiki=Pfeiffer_effect}
The Pfeiffer effect refers to an optical phenomenon observed in certain types of materials when they are subjected to mechanical stress. Specifically, it is related to the anisotropic optical properties of certain crystals, particularly in mineralogy and materials science. When a crystal is deformed or stressed, the optical properties—such as birefringence—can change, leading to variations in the light transmission characteristics of the material.
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