Snowflake obsidian is a form of volcanic glass that features white or grayish “snowflake” shapes made of embedded cristobalite. These pretty patterns are not artificially added as a cheap ...

Expansive lava flows in the Sáttítla Highlands was captured by satellites ahead of the recent designation of the area as a national monument.

A decade earlier, Rademaker’s advisor, archaeologist Daniel Sandweiss, had made the unexpected discovery of flakes and tools made of obsidian, a volcanic rock, in excavations at one of the oldest ...

referring to the wealth of obsidian deposits in the area, which were formed by ancient lava flows. The dormant Medicine Lake Volcano sits in the middle of the monument and stretches over an area ...