Pleochroism
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Definition
An optical phenomenon in which a gemstone appears to show different colors or color intensities when viewed from different crystallographic directions.
Detailed Explanation
宝石を異なる結晶学的方向から観察したときに、異なる色または色の強度が見える光学現象で、異方性結晶に固有の性質です。二色性（2方向）と三色性（3方向）があります。