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 ...

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 ...

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 ...

The commercial obsidian trade played an important role ... 3000 B.C. Obsidian is a volcanic glass formed as an extrusive igneous rock (SiO 2 as main component ranging between 66% and 75%) that ...

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 igneous rock obsidian has long been a useful reference for archaeologists to piece together the past, given Maori used it for a range of tools and activities. University of Auckland researcher ...