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obsidian
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A glassy fine grained extrusive rock?
Obsidian
What extrusive igneous rock has a mafic composition and a glassy texture?
Basaltic glass
Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
noncrystalline glassy texture
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
Smooth glassy rock?
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.
What is a glassy grained extrusive rock?
Obsidian.
A glassy fine grained extrusive rock?
Obsidian
How can you tell that scoria is an extrusive rock?
It is fine grained to glassy and contains vesicles.
Is glassy igneous rocks intrusive or extrusive?
Granite gneiss is a metamorphic rock and would not be considered extrusive (rock formed from molten material at or near the surface).
What extrusive igneous rock has a mafic composition and a glassy texture?
Basaltic glass
Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
noncrystalline glassy texture
Which igneous rocks would be formed by the fastest cooling of lava?
Glassy textured extrusive igneous rock, such as 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.
How is pumice classified?
Pumice is classified as a felsic, glassy, highly vesicular, extrusive igneous rock.
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.
Smooth glassy rock?
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.
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
