Rainbow Obsidian

Rainbow obsidian is a natural volcanic glass that exhibits a colorful sheen or “rainbow” effect when viewed in proper lighting. It is formed when molten lava rapidly cools and solidifies before crystallization can occur, resulting in a smooth, glassy texture.

The rainbow effect of obsidian is caused by the reflection, refraction, and interference of light on microscopic gas bubbles or thin layers of mineral inclusions within the glass. These layers can create a wide range of colors, including purple, blue, green, yellow, and orange.