Blue ice

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Blue ice is a form of ice that occurs in a glacier. It has been highly compressed by the weight of the overlying snow such that the ice crystals become enlarged. It is this enlargement that is responsible for the ice's blue color.

Excerpt from the Wikipedia article “Blue ice (glacial)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Visit Greenland from Nuuk, Greenland, CC BY 2.0, via Wikimedia Commons.