Obsidian from the island of Milos, found in Franchthi Cave, shows seafaring in Greece began over 11,000 years ago in the Palaeolithic era.

This lustrous rock can be found in nature, but it's easily accessible in stores. Intense, mysterious, and psychically potent, the Obsidian crystal captivates as much as it can perplex the curious ...

Shiny and sharp, obsidian is enjoying a bit of a pop culture moment. It plays a central role in HBO’s hit fantasy series Game of Thrones, now wrapping its final season. Called dragonglass on the show, ...