Obsidian is a naturally occurring volcanic glass that forms into an igneous rock. Obsidian rocks can be found in many areas in the Panhandle of Texas. This is a signature Glamarillo Mix made by our in-house team. It is a special blend of chunky and fine polyester glitters creating a beautiful mixture of blacks, green, and a hit of pink and blues. It works with all clear adhesives and is a perfect touch to that special tumbler. Like all Glamarillo glitter, this one-of-a-kind mixture is made of high quality, solvent and heat resistant polyester glitter. It is shipped in 1 ounce increments in a BPA free zip lock type bag.