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Is Obsidian formed when rapidly cooling ions are randomly distributed creating a texture?
Glassy
What type of extrusive rock can be easily mistaken for glass?
Obsidian is an extrusive rock formed from rapidly cooling lava with a glassy appearance that can easily be mistaken for actual glass due to its smooth texture and lack of crystal structure.
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.
A glassy fine grained extrusive rock?
This description likely fits obsidian, a natural glass formed from rapidly cooling lava. Obsidian is characterized by its fine-grained texture and shiny, smooth surface. It is commonly black, but can also be found in other colors like brown, red, or green.
What 2 igneous are formed by fast cooling lava?
Two igneous rocks formed by fast cooling lava are basalt, which is a fine-grained volcanic rock, and obsidian, which is a natural glass formed from rapidly cooling lava without crystal growth.
What rock is black and glassy and rapidly cooling lava?
obsidian
Is Obsidian formed when rapidly cooling ions are randomly distributed creating a texture?
Glassy
Do obsidian rocks cool fast?
Obsidian is formed from very rapidly cooling lava.
Is pumice and obsidian forms of volcanic gas?
Partially correct. Pumice forms from rapidly cooling lava containing volatiles (water and gas) and obsidian forms from rapidly cooling lava that doesn't contain volatiles. Bubbles from volatiles are frozen in place and cannot escape before the lava hardens forming pumice. Obsidian and pumice are sometimes found together although obsidian itself is relatively rare.
What family is obsidian in?
Obsidian is part of the Granite family of igneous rocks.
Why does obsidian have a glassy texture?
Obsidian has a glassy texture because it forms from rapidly cooling lava without much time for crystal growth. This quick cooling process prevents the formation of crystals, resulting in a smooth and reflective surface similar to glass.
What type of rock had no visible crystals as result of rapid cooling?
Obsidian is an example of a rapidly cooled rock, also known as volcanic glass.
Smooth glassy rock that is formed when lava cools?
Obsidian
Is obsidian rock metamorphic rock sedimentary or igneous?
Obsidian is an extrusive igneous rock, formed from rapidly cooling lava.
How fast does the lava cool when it is forming an obsidian rock?
Obsidian is formed and cooled so rapidly from lava that it is a glass, not crystalline in structure. The cooling is obviously very rapid and solidification could probably measured in minutes.
What type of extrusive rock can be easily mistaken for glass?
Obsidian is an extrusive rock formed from rapidly cooling lava with a glassy appearance that can easily be mistaken for actual glass due to its smooth texture and lack of crystal structure.
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.
