Adularescence is an optical phenomenon that occurs in certain types of gemstones, particularly in moonstone. It refers to a milky, bluish-white glow that appears to move or float across the surface of the stone as it is turned in the light. This effect is caused by the scattering of light by microscopic layers of feldspar within the gemstone, which create a play of light and color that appears to shift and change as the stone is viewed from different angles. Adularescence is highly prized by gemstone collectors and enthusiasts, and is often used as a measure of a moonstone's quality and value.
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