Crystal islet

Here’s another icy image. It was taken taken just moments before the few I posted the other day. This one differs in that the icy surface is clear, rather than frosted. I wish I knew more about conditions under which ice forms in these different ways. In any event, it was Joanna who liked this unusual growth of crystals. I like the palette of muted color in the back. It’s easy to convince yourself that the little cluster formed directly on top of the leaves. If you look closely, however, you will see that it is above them, and grew on top of the overlying ice sheet (also a clustering of crystals). I wonder if, what looks like a seed embedded near the center of the crystal, provided the nucleation site for its formation? If so, why didn’t crystals form around a similar seed to the right?
Crystal

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