Mt St Helen Obsidian Rough. Fantastic Neon Blue and Emerald Green colors. Natural Obsidian which is volcanic glass which is sometimes called Emerald Obsidianite, from the 1980 volcanic eruption in Washington State, large chunks of this natural obsidian were discovered and gathered by a Mr. Buyer of Seattle who developed the process of melting down this material, removing the impurities and then adding the color, the stone is natural except for the dying process. Transparent and very clean.