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It can be use for jewellery and stone age arrowheads, as the obsidian was much sharper when made into a specific shape. It can be sharpened to a very thin thickness.
It is very shiny and is black. This is why Obsidian is common to be used in jewellery.
Obsidian is igneous rock, which means that it was formed either inside (intrusive) or outside (extrusive) of the volcano. Igneous rocks are basically cooled lava, or magma.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoObsidian can be used to make sharp knives (this is what the Aztecs used for heart sacrifices) or jewelry
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I think there are more than two uses of volcanic rock. There are two FORMS of volcanic rock. One is pumice and the other is obsidian. Pumice is often used for landscaping, personal beauty uses (callus removal), etc. The other is obsidian. Obsidian is like glass and ancient people's used it for tools. Knives, arrowheads, and other tools that one would want to have a sharp edge are perfect uses of obsidian. In modern times, obsidian is used for jewelry, art, and even some modern day surgical tools. Check out geology.com if you have more questions about rocks...
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