Snowflake obsidian is a form of volcanic glass that features white or ... It appears as a dark glassy rock that’s typically black, although it can take on hues of green, brown, and other colors ...

The world’s most active volcano is at it again after Hawaii’s Kilauea began its seventh episode of its ongoing eruption, with ...

The chemical makeup of mineral inclusions preserved in impact glass hints at the site of a missing impact crater.

Additionally, the porous volcanic rock plays a critical role in recharging ... place" in the Ajumawi language. Obsidian is a black volcanic glass; deposits found here were historically used ...