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∙ 12y ago
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∙ 14y agoHeadliner
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What are rocks that have a glassy texture called?
Obsidian
What type of rock is black all the way through non magnetic and non flamable?
Basalt is on of the many rocks that is black, obsidian (a volcanic glass) is another.
Can a obsidian rock be found in Louisiana?
No, obsidian is also called 'volcanic glass,' since it is a product of cooled lava. Since there are no volcanoes in Louisiana there will not be any natural obsidian.
What are igneous extrusions?
== == Extrusive igneous rocks are formed from the solidification of lava on or above the surface. Rapid cooling from exposure to air or water results in rapid crystallization of their component minerals, normally creating a fine grained texture as opposed to intrusive igneous rocks which have a coarser texture. Examples of extrusive igneous rocks would include obsidian, pumice, basalt, and rhyolite.
Does sandstone retain heat?
All rock retains heat. Darker rocks such as schist or obsidian are darker and as a result store heat and retain it more efficiently. Sandstone is often lighter and more reflective.
How does one make a cutting tool with obsidian?
Making a cutting tool using obsidian rock is quite easy. The cavemen used to smack pieces of obsidian with other rocks until the obsidian was thin and sharp as a knife.
What family is obsidian in?
Obsidian is part of the Granite family of igneous rocks.
What are very smooth rocks called?
obsidian obsidian
How did ancient people make weapons?
Ancient people used obsidian ( rocks used to make weapons)
Why do obsidian rocks look dark?
because an obsidian rock has low silica
What does obsidian mean in rocks and minerals?
Obsidian is black glass formed by volcanoes.
What type of rocks are pumice obsidian and granite?
Igneous rocks
What are rocks that have a glassy texture called?
Obsidian
What rocks do not weather or erode?
obsidian
Do obsidian rocks cool fast?
Obsidian is formed from very rapidly cooling lava.
Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
What color is an obsidian rock?
obsidian rocks are red and black also sometimes orange
