Obsidian (/ əbˈsɪdi.ən, ɒb -/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. [6] . Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.

Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a " mineraloid ."

Dec 6, 2024 · Obsidian is an igneous rock occurring as a natural glass that is formed by the rapid cooling of viscous lava from volcanoes. Where is obsidian found? Some of the best-known occurrences of obsidian are at Mount Hekla in Iceland, the Eolie Islands off the coast of Italy, and Obsidian Cliff in Yellowstone National Park, U.S.

Nov 8, 2023 · Obsidian is an extrusive igneous rock. It is occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes . Result of this formed, glass occupies more than 80 % and that have seeming conchoidal fracture and vitreous luster.

Jun 23, 2023 · Obsidian is a hard, brittle, natural volcanic glass or mineraloid with a conchoidal fracture. It is not a mineral or crystal. However, it is often considered a volcanic or an extrusive igneous rock. Usually, obsidian is a rhyolite glass formed from rapid quenching viscous, silica-rich lava or magma.

Obsidian is an "extrusive” rock, which means it is made from magma that erupted out of a volcano. If it was an igneous rock that formed from magma underground and did not erupt, it would have been called an "intrusive" rock.

Aug 17, 2019 · The obsidian is the rock created by fast-cooled lava, the material father. Extensive obsidian formation can happen if felsic magma quickly recools on the corners of a volcanic dome or felsic lava stream, or if lava cools during abrupt water or wind touch.

Jan 11, 2024 · Obsidian is a naturally occurring volcanic glass and one of the most striking types of igneous rocks. This article delves into what obsidian is, its formation and composition, the different...

Obsidian is a naturally occurring volcanic glass formed when molten lava from a volcano cools rapidly with minimal crystal growth. It is an igneous rock , meaning it forms from the cooling and solidification of magma or lava.

Obsidian, or lapis obsidianus, is essentially dark glass. A type of igneous rock, called extrusive igneous rock, obsidian is extruded from the Earth as lava which when rapidly cooled forms a natural glass. As a volcanic glass, obsidian is mineral-like, or mineraloid, but is not a true mineral.