Obsidian containing aligned micro-bubbles or mineral particles. At certain angles, a golden sheen surfaces—caused by minute inclusions reflecting light.

Formed, like all obsidian, by the rapid cooling of lava. But this lustre appears only when cooling rate and gas content meet specific conditions. Not every obsidian carries this gold.

Found in volcanic regions of Mexico and Brazil. In the Aztec era, obsidian served as blade, currency, and mirror. Whether you find gold inside the black depends on the angle of light.