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Obsidian: Its texture is glassy. Obsidian is extrusive or volcanic, because the instantaneous cooling that produces such rocks is a surface phenomenon. Obsidian is amorphous, so, unlike true rocks, it is not composed of minerals.

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What is the name of a smooth glassy black ingeous rock?

Obsidian


What texture of obsidian?

Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.


Which rock is very smooth and has no visible mineral grains?

Glassy textuered rocks, such as Obsidian.


What is a smooth glassy black igneous rock?

The rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed during rapid cooling of lava. It is usually black in color and has a smooth, glassy texture.


What type of volcanic rock is extremely vesicular and glassy?

Obsidian is a type of volcanic rock that is extremely vesicular and glassy in appearance. It forms when lava cools quickly with minimal crystal growth, resulting in a smooth texture and shiny appearance.


What igneous rock has a smooth glass like texture?

Obsidian is an igneous rock that has a smooth glass-like texture. It is formed when lava cools rapidly without crystal formation, resulting in a glassy texture.


A smooth glassy black igneos rock?

The igneous rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed from the rapid cooling of molten lava. Its smooth, glassy texture and black color make it a popular material for decorative items and tools.


Is obsidian rapidly cooling?

Yes that is why it makes that glassy look to it.


What is the luster of igneous rock?

i think that igneous and metamorphic rocks uses luster because maybe they have it in them


What is a glassy rock?

Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.


What does term ''glassy'' mean when talking about igneous rock texture?

Glassy texture in igneous rocks refers to a smooth and reflective appearance resembling glass. This texture is formed when the molten rock cools rapidly, preventing mineral crystals from developing. Glassy texture is typically seen in obsidian, a type of volcanic glass.


Why is the extrusive igneous rock obsidian glassy?

Obsidian has a glassy texture because it cools very quickly when erupted onto the Earth's surface. This rapid cooling prevents crystal formation, resulting in a smooth, glass-like appearance. The high silica content of obsidian also contributes to its glassy nature.