Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, a hydrated silicon dioxide. This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.
Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, a hydrated silicon dioxide. This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.
Source: Wikipedia "Opalescence" · CC BY-SA 4.0
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