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Obsidian rocks are formed from minerals underground in places like the earth's core and volcanoes. They require heat and pressure, which squishes the minerals together to form a rock. There is air trapped inside the rock when it is formed, which creates the bubbles, or "holes" inside the rock if you look at one. When I find out more about it, then I will let you know more about it.
What else can I help you with?
What rocks don't contain minerals?
most rocks from what i know contain minerals especially sedimentary rocks. and don't all rocks eventually become sedimentary rocks so really don't they all contain minerals to some extent :) hope it helped (by the way i am only a gcse student)
Does an obsidian rock have minerals you can see with magnification?
No, obsidian is volcanic glass.
Why do obsidian rocks look dark?
because an obsidian rock has low silica
Where do you find Obsidian rock Philippines bacoor zapote cavite?
email me: vintagearchaeologyph @ yahoo . com Loads of rocks and minerals collections. Thanks
Are all rocks made of minerals?
Not all rocks are made of minerals. Rocks can be composed of minerals or can be made up of organic materials like shells, fossils, or volcanic glass. Some rocks, like coal or obsidian, do not contain minerals but are still considered rocks.
What igneous rock does not have any minerals in it?
Obsidian is an igneous rock that technically is not composed of minerals. It is a natural glass.
What of rock is shiny and clear?
The rocks amber and obsidian can be clear in polished thin specimens. Many minerals are shiny and clear in pure crystalline form.
Are rocks composed of minerals?
Rocks are for the most part composed of one or more minerals. Obsidian is an exception because the mineral solution (lava) did not have time to form mineral crystals because of very rapid cooling. However, most obsidian will still contain some mineral crystals or crystal inclusions.
What kind of igneous rock is obsidian?
Obsidian is an igneous rock. However it differs from other rocks because it contains no minerals. It consists of natural glass, which is not a mineral because it has no crystal structure.Answers from McDougal Littell, Earth Science book
What is a glassy rock?
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
What kind of rock is clear and shiny?
The rocks amber and obsidian can be clear in polished thin specimens. Many minerals are shiny and clear in pure crystalline form.
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.
