15 Facts About Obsidian


Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth.

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Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.

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Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges.

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Obsidian is formed from quickly cooled lava, which is the parent material.

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Obsidian is mineral-like, but not a true mineral because, as a glass, it is not crystalline; in addition, its composition is too variable to be classified as a mineral.

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Obsidian is found near volcanoes in locations which have undergone rhyolitic eruptions.

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Obsidian can be found in the eastern U S states of Virginia, Pennsylvania and North Carolina.

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Obsidian bladelets were used in ritual circumcisions and cutting of umbilical cords of newborns.

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Obsidian artifacts are common at Tell Brak, one of the earliest Mesopotamian urban centers, dating to the late fifth millennium BC.

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Obsidian was valued in Stone Age cultures because, like flint, it could be fractured to produce sharp blades or arrowheads in a process called knapping.

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Obsidian played an important role in the transmission of Neolithic knowledge and experiences.

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Obsidian has been found in Gilat, a site in the western Negev in Israel.

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Obsidian mirrors were used by some Aztec priests to conjure visions and make prophesies.

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Obsidian was used on Rapa Nui for edged tools such as Mataia and the pupils of the eyes of their Moai, which were encircled by rings of bird bone.

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Obsidian is used by some surgeons for scalpel blades, although this is not approved by the US Food and Drug Administration for use on humans.

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