Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast ...

Is rainbow obsidian rock or glass? As with other forms of obsidian, rainbow obsidian is both rock and glass. However, this isn’t the same kind of glass that’s used in your nice new French ...

NASA's Juno spacecraft found Io’s surface is as smooth as glass, just like volcanically created obsidian glass ...

It was a surprising discovery when scientists examining the remains of a man who died in bed in the ancient city of Herculaneum after Italy's Mount Vesuvius erupted in 79 AD found dark fragments ...

Scientists say they have worked out the sequence of events that likely killed the victim and led to the formation of the unique and puzzling glass ...

A man, thought to be the custodian of a religious group, was believed to be in his bed asleep, when a super-hot ash cloud hit ...