Thank you everybody! Indeed, the crystals are just as beautiful as the halos that they create.
As to naming this thing we are discussing it, but it is not too easy. This peculiar orientation does not take place in airborne crystals so it is somewhat of a specialty. Some name will eventually stick.
We are preparing a little account about this that we hope to publish some time next week or soon after that.
The cold never bothers me as long as I am prepared. I prefer devastatingly cold winters to soggy ones and I enjoy the darkness. There is such great clothing available these days that it makes even long periods in very cold temps a doddle. Loads of layers and quality boots are essential.
Ps. Alec, the rule number one about the secret ancient halo society is that there is no secret ancient halo society. Hehe.