Yes, roiling – a term used in the world of gemology and frequently
by rockhounds. And, that would be me! If you look at a pot of boiling water, you can see the general “roiling”
effect as bubbles leave the bottom on the pot and roll to the surface. There –
that’s what we mean by roiling and it does appear in gems and rocks, as well! And,
without a doubt it also happens in the sky – at least in this part of the world.
