mineral 자주색 amethyst Stone purple Rock quartz 제비꽃 violet fashion_accessory

Great Amethyst

Amethyst is a type of violet or blue-purple quartz. It is translucent or transparent, and its violet coloration is often unevenly distributed, which is why the stone is sometimes subjected to thermal treatment to color evenly. With prolonged exposure to sunlight or strong heat gradually loses its color or acquires yellow, brown or green coloration. The violet color is due to manganese impurities or the third valence iron content.