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
보석의 최고 굴절률과 최저 굴절률의 차이로, 빛이 서로 다른 속도로 이동하는 두 광선으로 분리되는 이방성(비등방성) 결정에서 관측됩니다. 복굴절 수치는 보석 감별에 중요한 특성 중 하나입니다.