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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
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoThere are different types of igneous rocks that are actually glass and three of them are obsedian, pumice and scoria. These all are extrusive igneous rocks that are glass.
Wiki User
∙ 13y agoIt is referred to as mafic.
Wiki User
∙ 16y agoObsidian.
Wiki User
∙ 13y agoObsidian.
Wiki User
∙ 11y agoObsidian
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Is volcanic glass an intrusive or extrusive igneous rock?
Volcanic material is extrusive.
A lava flow is an example of an igneous rock one of the two main igneous rock groups?
It is an example of extrusive igneous rock.
What extrusive igneous rock has a mafic composition and a glassy texture?
Basaltic glass
What are igneous rocks formed at the earths surface called?
Extrusive igneous rocks.
Is diorite intrusive or extrusive?
Diorite is an intrusive igneous rock. Its extrusive equivalent is andesite.
Is volcanic glass an intrusive or extrusive igneous rock?
Volcanic material is extrusive.
What igneous rock has crystals that are not visible?
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
What is the obsidian rock type?
Obsidian is an extrusive felsic igneous rock.
A lava flow is an example of an igneous rock one of the two main igneous rock groups?
It is an example of extrusive igneous rock.
Where is Obsidian?
Obsidian is a naturally occurring glass formed as an extrusive igneous rock
What is the most extrusive igneous rock?
Basalt is the most common extrusive igneous rock.
What is category of igneous extrusive rock?
Some igneous extrusive rocks include obsidian, basalt, andesite, rhyolite, scoria, pumice, basaltic glass. If you want more, go to page 6 on the Earth Science Reference Tables at the related link.
What kind of rock is formed after a volcano erupts?
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
What extrusive igneous rock has a mafic composition and a glassy texture?
Basaltic glass
Which is not a common extrusive igneous rock?
There are so many rocks that can be classified as not a common extrusive igneous rock. The most common extrusive igneous rock is basalt. Extrusive rocks are formed as a result of lava solidifying.
Is pumice an igneous rock?
YES! It is an extrusive Igneous rock
Is obsidian a intrusive or extrusive igneous rock?
Andesite is considered an extrusive igneous rock.
