Beautiful Deep Blue Ice

It's Blue Ice. According to Wikipedia:
"Blue ice happens when snow falls on a glacier, is compressed and then becomes part of a glacier that winds its way toward a body of water. During its travels, all of the air bubbles that are trapped in the ice are squeezed out, and the size of the ice crystals increases, making it clear."

The ice is blue for the same reason water is blue. Namely, it is a result of an overtone of a OH molecular stretch in the water which absorbs light at the red end of the visible spectrum.

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