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It is a usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by very rapid cooling of lava.
The curved fracture surfaces are more correctly termed conchoidal fractures and the "glass" is said to have a "vitreous" texture as the material cools so rapidly that crystals do not have time to form.
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∙ 6y ago
Wiki User
∙ 12y agoObsidian is formed from the extreme rapid cooling of lava. The rock has been named 'volcanic glass' as it is very smooth and is also translucent. The rock is igneous as it is formed from lava.
Wiki User
∙ 13y agoA usally black mor banded hard volcanic glass that display shiny ,curved surfaces when fracture and rapid cooling lava bye Victoriasometimesright
Wiki User
∙ 12y agoobsidian is ''volcanic glass''. It happens when water and lava touch, the chemical compound is
70--75% SiO2,
plus MgO, Fe3O4
Wiki User
∙ 12y agoFelsic lava.
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What are some examples of igneous rocks with the meaning?
Igneous rocks are formed from cooling lava. Some examples are obsidian And basalt.
Pumice obsidian and scoria are kinds of?
These are all formed by volcanic activity. Igneous
What is an extrusive igneous rock that is actually glass?
One type of glassy igneous rock is obsidian, which is black and glass-like. Any type of igneous rock that is glassy would be a extrusive rock, which means it was formed outside the earths crust and cooled quickly, making for a fine grain and small crystals. hope this helps
What are very smooth rocks called?
obsidian obsidian
What rocks do not weather or erode?
obsidian
What does obsidian mean in rocks and minerals?
Obsidian is black glass formed by volcanoes.
How is obsidian and coal rock alike?
Obsidian and coal are both rocks and they are formed by lava
Do obsidian rocks cool fast?
Obsidian is formed from very rapidly cooling lava.
What type of rocks are pumice obsidian and granite?
Igneous rocks
What type of rock froms when lava cools very quickly?
Volcanic rocks like obsidian is formed when lava undergoes very rapid cooling.
Which two igneous rocks are formed by fast cooled lava?
Obsidian and Pāhoehoe lava
Smooth glassy rock that is formed when lava cools?
Obsidian
What are some examples of igneous rocks with the meaning?
Igneous rocks are formed from cooling lava. Some examples are obsidian And basalt.
What type of rock is formed by cool lava or magma?
An igneous rock is formed when magma cools and hardens. Some examples of igneous rocks are pumice and obsidian.
Does obsidian have layers of banding?
Obsidian is a type of volcanic glass formed from quickly cooled lava, so it does not have layers of banding like sedimentary rocks. Instead, obsidian typically has a smooth, uniform texture with occasional swirls or flow lines caused by the rapid cooling process.
How are granite and obsidian are different?
Granite is a rock, whereas obsidian is a type of glass formed by cooling lava.
What kind of formations are created when lava cools and hardens?
Igneous Rocks are formed. Obsidian is a volcanic glass, go to wikepidiea and search "list of rocks" and it will come up with all the different igneous, metamorphic, and sedimentary rocks and what they are.
