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Obsidian is black glass formed by volcanoes.
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∙ 10y ago
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Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
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.
How is obsidian dependent to minerals?
how is obsidian dependent on minerals
What are the minerals in obsidian?
Obsidian is, itself, a mineral.
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)
What are some rocks that aren't a mineral?
Rocks are not minerals. They are composed on one or more minerals. For example granite is composed primarily of the minerals quartz, potassium feldspar, and albite. There are some rocks, however, that are composed of substances that aren't minerals. Examples include coal, which is mostly organic, and glassy rocks such as obsidian, pumice, and some varieties of tuff.
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.
How do obsidian rocks get from being minerals to a rock?
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 minerals does obsidian have?
none
Does an obsidian rock have minerals you can see with magnification?
No, obsidian is volcanic glass.
Where do you find Obsidian rock Philippines bacoor zapote cavite?
email me: vintagearchaeologyph @ yahoo . com Loads of rocks and minerals collections. Thanks
what is the difference of igneous rocks?
What do you mean? Do you mean intrusive or extrusive or the types of rocks themselves? Fine. Here's a list Basalt Granite Pumice Obsidian
