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 sand gets its color from obsidian, a black volcanic glass that forms when lava cools ... resort town with charcoal-hued sand. A massive rock, Mesa Vouno, sits between the two beaches.

A giant patch of black, fossilized lava that was spewed ... according to the U.S. Geological Survey. Some of the volcanic rocks are up to 6 million years old, while others were left by eruptions ...

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 ...