Aztec duck-head pendants recovered from Tenochtitlán were made using volcanic glass called obsidian. - Mirsa Islas/Courtesy Proyecto Templo Mayor, INAH. Sign up for CNN’s Wonder Theory science ...

Aztec duck-head pendants recovered from Tenochtitlán were made using volcanic glass called obsidian. Mirsa Islas/Courtesy Proyecto Templo Mayor, INAH.

The Aztec Empire once hosted an expansive trade network that brought volcanic glass to its capital from right across Mesoamerica, from coast to coast. The largest compositional study of obsidian ...