Kokopelli Obsidian

Electric Blue Obsidian

Silver Obsidian

Rarely, obsidian has an iridescent or metallic "sheen" caused by light reflecting from minute inclusions of mineral crystals, rock debris, or gas. These colored specimens are known as "rainbow obsidian", "electric blue obsidian "or "silver obsidian," depending upon the color of the sheen or iridescence. These specimens are very desirable for the manufacture of jewelry.

Rainbow Obsidian