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grease ice

a very thin, soupy layer of frazil crystals clumped together, which makes the ocean surface resemble an oil slick.

Grease ice (thin, light-grey area) with thick ice floes. (Photo courtesy of Ted Maksym, United States Naval Academy.)
Grease ice (thin, light-grey area) with thick ice floes. (Photo courtesy of Ted Maksym, United States Naval Academy.)