opalesce

Verb
  1. Reflect light or colors like an opal (synset 202771189)
    "Distant clouds opalesce like pale brocade"; "raindrops caught in a sunbeam seem to opalesce"
    is a type of: reflect, shine - be bright by reflecting or casting light
  2. Exhibit a play of colors like that of an opal (synset 202740015)
    "This nitrate opalesces under certain conditions"
    is a type of: iridesce - be iridescent

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