0
Glassy rocks form near or in volcanoes, or just under high pressure and heat.
For volcanoes, lava will harden on the surface for active volcanoes, and will harden inside the volcano if it's inactive.
Under normal circumstances, such as with sedimentary rocks, rocks deep within the earth will become pressurized and flatten, then heat up, creating a glassy rock.
Wiki User
∙ 8y ago
Add your answer:
Earn +20 pts
A smooth glassy black igneos rock?
It is obsidian. Obsidian was mostly used as an arrowhead for hunting.
What does a blind horses eye look like?
It sometimes has a blue glassy look to it!
What process gradually changes rocks from one form to another?
erosion and weathering
What rock is form from skeletal remains pf coral and lime-secreting sea animals?
Limestone
What happens to rock fragments and other materials carried by water?
Given enough time, they may collect in sedimentary basins and form rock through a process of lithification.
What is a glassy rock that forms when crystals do not get to form?
feldspar
What is a glassy rock?
Obsidian is a naturally occurring volcanic form of glass.
Do Glassy igneous rocks form when magma cools so slowly that mineral crystals cannot grow?
The "glassy" igneous rock is called obsidian, and it occurs when the magma cools very rapidly.
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.
Lava that cools so quickly that ions do not have time to arrange into crystals will form igneous rock with a?
glassy texture, hope this helps :)
How do Igneous rock with glassy textures?
An igneous rock with a glassy texture cooled from its' liquid state very quickly, an example of this would be obsidian, a volcanic glass.
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 polished mineral with a glassy luster called?
a rock
A glassy fine grained extrusive rock?
Obsidian
What is a glassy fine-graind extrusive rock?
obsidian
