Like other igneous rocks, the glossy glass originates from molten rock that has been spewed out from the bowels of the Earth via volcanoes. Before we get into the snowflakes, obsidian is formed ...

This molten earth origin is what classes rainbow obsidian as an igneous rock. Lava destined to become obsidian cools rapidly once on the surface and, thanks to its viscous nature, is also below ...

Extrusive igneous rocks are formed by magma that has erupted onto the surface as lava and then cooled quickly. Obsidian is an example of an extrusive igneous rock. Obsidian has crystals which are ...

The Obsidian arrives as the second installment in the firm’s lineup of luxury, art-inspired audio products. Taking its name from the igneous rock that forms out of a volcano’s magma ...

The first episode of "Game of Thrones" Season 8 premiered April 14. It has been two years since the last time HBO released an episode of the TV series adaptation of George RR Martin’s ...