Very good, hibernicus. That makes sense to me--and I especially appreciate your coupling up of the opposites.

Sounds as though it would be good to have a definite separate term for sublimnation's opposite!

I, too, had thought of the process of crystallization as observed in minerals, but didn't want to mix things up so much at that point.

What's very interesting to me is this:

If it's thought to be true that something can move from its gaseous state directly to solid, how can we know for sure? Do we have photography that can slow things down enough that we would know definitely that there is no liquid state? And, if not with some technologically advanced form of photography, do we have others kinds of technology that verify this?