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What is an extrusive igneous rock that is actually glass?
Obsidian is an extrusive igneous rock that forms when lava cools quickly and solidifies into a glass-like material without crystal formation. It is typically black in color and has a smooth, glassy texture due to its rapid cooling process.
What extrusive igneous rock has a mafic composition and a glassy texture?
Obsidian is an extrusive igneous rock with a mafic composition and a glassy texture. This rock forms from the rapid cooling of lava with high silica content, preventing the growth of mineral crystals and resulting in its glassy appearance.
What is a glassy fine-graind extrusive rock?
obsidian
What igneous rock has no visible crystals?
Granite is a coarse grained igneous rock without Pyroxene.
Is obsidian an instrusive or extrusive igneous rock how do you know?
Obsidian is an extrusive rock and is formed from rapidly cooling magma. Obsidian is also known as volcanic glass and one can find only sub-microscopic crystals in it. This is because it was cooled too fastly for large crystals to form. If the material that obsidian consists of were an intrusive rock and had a lot of time to cool down, one would find that it would be composed of easily visible crystals.
Is obsidian a intrusive or extrusive igneous rock?
Andesite is considered an extrusive igneous rock.
What is a glassy grained extrusive rock?
Obsidian.
Where does obsidian rock cools down?
Obsidian is an glassy, extrusive, igneous rock that is found in areas that have experienced rhyolitic eruptions. Obsidian is formed when the rhyolitic lava comes into contact with water. This quick-cooling results in the glassy texture of obsidian.
What is an extrusive igneous rock that is actually glass?
Obsidian is an extrusive igneous rock that forms when lava cools quickly and solidifies into a glass-like material without crystal formation. It is typically black in color and has a smooth, glassy texture due to its rapid cooling process.
What extrusive igneous rock has a mafic composition and a glassy texture?
Obsidian is an extrusive igneous rock with a mafic composition and a glassy texture. This rock forms from the rapid cooling of lava with high silica content, preventing the growth of mineral crystals and resulting in its glassy appearance.
What is a glassy fine-graind extrusive rock?
obsidian
What is the obsidian rock type?
Obsidian is an extrusive felsic igneous rock.
Which rock am igneous extrusive black?
Basalt, pumice, and obsidian are all extrusive igneous rocks which can appear as black rock.
Where is Obsidian?
Obsidian is a naturally occurring glass formed as an extrusive igneous rock
What igneous rock has no visible crystals?
Granite is a coarse grained igneous rock without Pyroxene.
What kind of igneous rock is obsidian?
Obsidian is an igneous rock. However it differs from other rocks because it contains no minerals. It consists of natural glass, which is not a mineral because it has no crystal structure.Answers from McDougal Littell, Earth Science book
What kind of rock is formed after a volcano erupts?
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
