Less pure silica forms the natural glass obsidian.
2.
They made stone tools, including those from Darwin Glass a natural glass formed from a meteorite impact.
3.
Sometimes, a residual portion of the matrix fails to crystallize at all, instead becoming a natural glass or obsidian.
4.
Also, the widely dispersed natural glass ( obsidian ) increases the chances of a flat tire on the roads.
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The natural glass fibers also are much more flexible than manufactured fiber optic cable that can crack if bent too far.
6.
As such, they are considered tektites-bodies composed of black or dark brown natural glass formed from terrestrial debris ejected during extraterrestrial, meteorite impacts.
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Obsidian, as a natural glass material, is peculiar because when it is exposed to water, the surface develops a patinated layer of hydrated perlite.
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On the other hand, the number of such tracks in natural glasses and minerals can be used for fission track dating of the substance.
9.
Gritty and abrasive, it is made up of tiny fragments of rock, natural glass and minerals that get pulverized by earthquakes and internal explosions.
10.
In 1934, the " Bend Bulletin " reported that Forbes had found numerous obsidian sites and had identified seven specific varieties of natural glass around Glass Buttes.
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