blue ice

noun Geology.
the oldest and densest ice in a glacier, distinguished by a pale-blue color.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  blue ice1
Part of Speech:  n
Definition:  the clean compact and vividly blue ice formed in glaciers by the recrystallization of snow
Main Entry:  blue ice2
Part of Speech:  n
Definition:  coarsely crystallized ice on the surface of some lakes and seas
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Example sentences
While we're not looking, a lot of that beautiful blue ice will have turned to
  beautiful blue sea.
He crunches down a set of concrete steps sprinkled with blue ice-melting
  pellets, to a windowless gray metal door.
Explore the blue ice caves with crystal clear walls, dripping icicles and an
  inside ice bar that sells drinks and snacks.
Over the years, pressure turns snow into inky blue ice that creates a contrast
  to the fresh white of the surface.
Images for blue ice
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