Here is a collection of a variety of obsidian materials, mahogany, sheen, rainbow and maybe more! The rocks have been wetted so that one can see and discern the variety and type of material. Some have been cut, some are small pieces for tumbling (obsidian takes a very special technique to tumble, do not tumble like you would harder materials and never mix obsidian with harder materials!)
Pieces have been wetted to show their potential.
Some have related seeing this material selling for $6 - $10/# at Gem and Mineral Shows!