Candle ice crystals exposed in the "aufeis" area beyond the snout o Fountain Glacier on Bylot Island, far up in the Arctic off the NW coast of Greenland. This is a real permafrost area where summer melting is very limited -- and ice crystals of this type seem to be restricted to this sort of environment. The ice crystals form vertically, and may be just 2 cm across and up to a metre in length.
They seem to form where meltwater issuing from the glacier is unable to flow very far from the snout because this is a zone of continuous permafrost where temperatures seldom rise above freezing even in the middle of summer when the sun is shining.
From the superb Glaciers Online web site:
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