Ice Crystal II

Here’s a full feathery ice crystal from beside a stream; the closeup from23Jan is of a similar crystal to this:

img_2203_1crystalcs

The upright part is maybe a 10 to 15 mm high. The crystal was growing on a snowy stream bank, about a foot above running water. Water vapor from the stream must be the source, but I love an explanation of why they only form in extreme cold.

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