Rare 'rainbow cloud' seen in Brazil

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Rainbow clouds occur when light scatters through water droplets or ice crystals. (Jean Oliveira via Storyful)

A rare and mesmerizing rainbow cloud was spotted in the skies above Caxias, Brazil, on Dec. 6.

A video was posted to Facebook of the weather phenomenon known as cloud iridescence.

According to AccuWeather, "cloud iridescence occurs when water droplets or ice crystals scatter light."

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