This is very nice Montana Agate from an old estate--very colorful, with lots of dendrites and swirly patterns. Very hard and polishes to a high sheen. These are fist-sized pieces and smaller--some can be cut & cabbed. All can be tumbled successfully. Figure to break it to quarter size or slightly larger for a jewelry mix. This is a 5-Lb bag of assorted Montana Agate at $4.50/Lb.