I've had this piece of Rainbow Obsidian for some time now.
I have had it for sale at different shows but it seems to keep coming back home with me.
So during when of the real cold days we had this winter I
noticed it sitting there on the ground and said;
"Well, Joe, are you going to cut that thing or are you just going to let it
freeze and fall into pieces?"

So I have started cutting it, and I'm very glad I did.
Here are a few preliminary pics.

Beautiful!