noun
iridescence; play of color; opalescence
Technical term in mineralogy and gemology for the optical phenomenon where a surface displays rainbow-like colors that shift with the viewing angle.
オパールの遊色効果は、内部の微細構造による光の干渉で生じる。
The play of color in opal is caused by light interference from its internal microstructure.
この鉱物標本には美しい遊色効果が見られる。
This mineral specimen exhibits a beautiful iridescence.