Snowflake obsidian is a form of volcanic glass that features white or grayish ... although it can take on hues of green, brown, and other colors due to impurities. Because of the lack of ...

Fragments from the brain of a man killed by the Mount Vesuvius eruption in the year 79 are smooth and shiny but still contain ...

Under the lamp, I suddenly saw small glassy remains glittering in the volcanic ash that filled the skull," Petrone said.

The most colorful of all may just be rainbow obsidian, which features an array of iridescent colors, including shades of green ... obsidian is both rock and glass. However, this isn’t the ...

“Obsidian glass, that is a volcanic glass, forms when lava is very quickly cooled, for example, where it enters into water,” Giordano added. However, the pyroclastic flows, composed of fast ...