Birefringence
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Definition
The difference between a gemstone's highest and lowest refractive indices, observed in anisotropic (non-cubic) crystals where light is split into two rays traveling at different speeds.
Detailed Explanation
La diferencia entre los índices de refracción más alto y más bajo de una gema, observable en cristales anisotrópicos (no cúbicos) donde la luz se divide en dos rayos que viajan a velocidades distintas.