Optic Character
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Definition
The fundamental optical classification of a gemstone as either isotropic (singly refractive) or anisotropic (doubly refractive), and if anisotropic, whether it is uniaxial or biaxial.
Detailed Explanation
宝石を等方性(一重屈折)または異方性(二重屈折)に分類し、異方性の場合はさらに一軸性または二軸性に分類する基本的な光学的性質の分類体系です。偏光鏡で確認できます。