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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 igneous rock has no visible crystals?
Granite is a coarse grained igneous rock without Pyroxene.
Why is obsidian considered a granitic rock?
Obsidian is an extrusive igneous rock because it is formed from the rapid cooling of magma after eruption ontoEarth's surface. The rapid cooling of lava results in a fine-grained texture, or in this case (with obsidian), a glassy texture, where cooling takes place so rapidly that mineral crystals do not have time to form. Rock that is formed from slow cooling magma beneath the surface is intrusive igneous rock, and exhibits visible mineral crystals.Obsidian is an extrusive igneous rock.
Is obsidian a metamorphic rock?
Obsidian is an igneous rock.So the answer is YES.
Is obsidian a mineral?
No. Obsidian is not crystalline so is not a mineral. It forms from the extremely rapid cooling of lava which means that crystals do not have time to form. This is described as a vitreous or glassy texture.
Where is Obsidian?
Obsidian is a naturally occurring glass formed as an extrusive igneous rock
What is a naturally occurring igneous rock more correctly called obsidian?
Obsidian is also called volcanic glass, an extrusive, largely non-crystalline, felsic igneous rock. Pumice is also a frothy form of 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.
Can you give a good description of obsidian?
This is taken from the Wikipedia article: "Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock." Igneous means that the material obsidian is made of is molten initially. Extrusive means that the material pours or explodes out of volcanoes, as opposed to remaining under the earth's surface. See links for more.
Is obsidian metamorphic igneous or sedimentary?
Obsidian is an igneous rock.
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 an igneous rock?
Obsidian is an igneous rock.So the answer is YES.
What type of igneous rock is this dark volcanic rock shiny like glass with sharp edges?
The dark volcanic rock you are describing is likely obsidian. Obsidian is a naturally occurring glass formed from rapidly cooled lava, which gives it a shiny appearance and sharp edges. Its lack of crystalline structure is what differentiates it from other igneous rocks, and it is often used for cutting tools and decorative items.
Dark igneous rock formed from lava?
obsidian obsidian
What group does obsidian belong to?
Obsidian is in the Igneous rock group.
What is the obsidian rock type?
Obsidian is an extrusive felsic igneous rock.
How is obsidian glass made?
Obsidian, or "volcanic glass," is made when molten rock comes out of a volcano and cools so quickly that no crystalline structure has time to form. This makes obsidian an extrusive igneous rock. The cooling occurs right at the surface.
