Obsidian is a type of igneous rock that cools instantly after a volcano explosion. Obsidian forms when lava enters the water directly after the volcano erupts. The water instantly cools the lava leaving the mineral crystals no time grow. obsidian does not have any minerals and is often classed as a mineraliod. Obsidian can be brown, black, or black and white. Obsidian can often be found in the shape of arrow heads because it was used as a primitive arrow. obsidian is still used to make scalpels.
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∙ 12y agoObsidian is a natural volcanic glass that is typically black in color and has a smooth, glossy appearance. It is formed from quickly cooling lava without any crystallization, giving it a sharp edge and a conchoidal fracture pattern. Obsidian is commonly used in making sharp-edged tools and decorative items due to its durability and unique appearance.
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∙ 6y agoOBSIDIAN - Formed from rapid cooling of felsic lavas, high in silica and aluminum. Obsidian is an extrusive igneous rock, formed from the extremely rapid cooling of felsic lava which includes orthoclase, quartz, and mica. Obsidian is a volcanic glass, meaning that the mineral constituents from which it formed did not have time to crystallize due to the rapid cooling.
Appearance
It most often appears as dark brown, greenish, or black in color, although it can also appear almost colorless. Obsidian has a glassy texture, but may appear cloudy from the inclusion of phenocrysts and microcrystals of various sizes, though technically it is not formed of minerals.
Properties
Obsidian displays a conchoidal (or clam shell) fracture upon breakage. The properties of obsidian made it a valuable commodity for stone age tool makers, as a blade could be fashioned with a sharpness finer than that of any steel, down to nearly molecular thinness.
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∙ 12y agoCan't Really tell
You're gonna be exact; it Varies (There exist different kinds)
But, they all consist Silicon Dioxide (SiO2), and am not so sure, but I think the black consist Ferrum(Iron(Fe))
This is pretty much the best answer i can give. So be careful to quote me, I am not a geologist:)
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∙ 12y agoobsidian is formed when a volcano is about to eroup an wen the molting lava melts it an comes out in to cool air it turns to a glass looking black rock called obsidian
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∙ 13y agoThey are smooth black rocks that are made from ash that cools of so fast that crystals don't have time to form there for creating the glassy texture
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∙ 10y agoObsidian can simply be describe as Volcanic Glass.
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∙ 12y agoIt is a glassy textured extrusive igneous rock. Its very fine grained and smooth with a luster.
No. Obsidian is brittle.
One type of obsidian is snowflake obsidian, which is black with white mineral inclusions that resemble snowflakes.
how is obsidian dependent on minerals
Obsidian is not magnetic.
The common name for obsidian rock is volcanic glass.
No. Obsidian is brittle.
One type of obsidian is snowflake obsidian, which is black with white mineral inclusions that resemble snowflakes.
Obsidian is, itself, a mineral.
Obsidian is a natural glass.
yes obsidian is a crystal.
Obsidian is an igneous rock.
Other names for obsidian is Apache tears, volcanic glass, and Black obsidian.
Snowflake Obsidian
how is obsidian dependent on minerals
Obsidian is not magnetic.
If their business is in dealing with obsidian products, and they do not own any obsidian mines, then yes they will need to buy it. If however they do not need obsidian then they do not have to buy it.
The common name for obsidian rock is volcanic glass.