0
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.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What is a smooth glassy black igneous rock?
Volcanic glass or obsidian.
A smooth glassy black igneous rock?
Yes. Obsidian is shiny on unweathered fracture surfaces. It is also an extrusive rock that is felsic, and can be worked to nearly molecular thinness at the edges.
What is the luster of scoria rock?
Vitreous (glassy)
A glassy fine grained extrusive rock?
Obsidian
What is a glassy fine-graind extrusive rock?
obsidian
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.
What is a smooth glassy black igneous rock?
Volcanic glass or obsidian.
Which rock is very smooth and has no visible mineral grains?
Glassy textuered rocks, such as Obsidian.
A smooth glassy black igneos rock?
It is obsidian. Obsidian was mostly used as an arrowhead for hunting.
What is the property of flowing very quikly in a liquid?
Smooth glassy rock that forms when lava cools
What is the luster of igneous rock?
i think that igneous and metamorphic rocks uses luster because maybe they have it in them
A smooth glassy black igneous rock?
Yes. Obsidian is shiny on unweathered fracture surfaces. It is also an extrusive rock that is felsic, and can be worked to nearly molecular thinness at the edges.
What is the texture of Intrusive igneous rocks?
An igneous rock has two different textures. Extrusive rocks generally are smooth and glassy. Intrusive rocks are generally coarse
What is the luster of scoria rock?
Vitreous (glassy)
What is a glassy grained extrusive rock?
Obsidian.
What is the glassy variety of acidic magma?
Obsidian is a glassy rock formed from rapid cooling of acidic magma.
