Adularescence

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  1. A milky white to bluish sheen in gemstones. CMD
  2. The changeable white to pale bluish luster of an adularia cut cabochon. Webster 3rd
  3. A floating, billowy, white or bluish light, seen in certain directions as a gemstone (usually adularia) is turned, caused by diffused reflection of light from parallel intergrowths of another feldspar of slightly different refractive index from the main mass. Syn: schiller
    Source: Dictionary of Mining, Mineral, and Related Terms
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