iridescent

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Related to iridescently: Goniochromism

ir·i·des·cent

(ir'i-des'ent),
Presenting multiple bright refractile colors, typically as a result of optical interference when incident white light is broken into its spectral components when reflected back through several thin-layered films.
[G. iris, rainbow]

iridescent

Presenting a rainbow-like play of colours as in soap bubbles.
References in periodicals archive ?
I watch as Sirius, shimmering iridescently as no diamond could ever hope to, slowly changes to a steady, opalescent gem as it rises in the eastern sky.