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Sacrifices were often painted blue. Caves were considered entrances ... Weapons were made from obsidian. The Mayans never used iron or steel for tools. Instead they used obsidian, a jet-black ...

From the Caribbean to Saudi Arabia, journalist Erik Trinidad has been on more than 130 dives. Now, he writes about a snorkeling destination in the Caribbean so rich that it rivals some of his dives.

Hundreds of obsidian artifacts have revealed where the Aztecs acquired the volcanic glass they used for tools, ornamental pieces or religious objects centuries ago — and their vast trade ...

Researchers analyzed 788 obsidian artifacts from Tenochtitlan, revealing that the Mexica (Aztec) Empire sourced this important material from at least eight different locations, including regions ...