Results for: Obsidian

In Geology

Why is obsidian glassy?

Obsidian is formed from extremely rapid cooling lava. Normally, igneous rock cools slowly enough for crystals to form. In the case of obsidian, the lava cools too quickly to a (MORE)
In Geology

Is obsidian a mineral?

No. Obsidian is not crystalline so is not a mineral. It forms from the extremely rapid cooling of lava which means that crystals do not have time to form. This is described as (MORE)
In Biology

Does obsidian have poison in it?

Yes, obsidian has a toxic poison that can make you very sick and/or kill you, if you get it in your body and don't go to the hospital. If you get obsidian in your body, I sugg (MORE)
In Geology

What is obsidian?

A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava. The curved fracture surfaces are mo (MORE)

What is an obsidian rocks?

An obsidian rock is an extrusive igneous rock that forms when a volcano erupts and has no time to crystallize, so it has a glassy texture. Obsidian rocks are generally black i (MORE)

Where do you find Obsidian?

ANSWER:Anywhere that a volcano has been active sometime in history. Its black glass fromed by the cooling of lava and has been used as surgical scapels since recorded history. (MORE)

How hard is obsidian?

Obsidian ranges from 5 to 5.5 on the Mohs hardness scale; harder than apatite, less hard than quartz.
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In Geology

What are the uses of obsidian?

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 (MORE)
In Uncategorized

What do we use obsidian for?

In the past, obsidian was used to make knives, arrowheads, spear  points, scrapers, and many other weapons and tools. Once these  discoveries were made, obsidian quickly bec (MORE)