obsidian - Hutchinson encyclopedia article about obsidian Printer Friendly
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obsidian

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obsidian

Black or dark-coloured glassy volcanic rock, chemically similar to granite, but formed by cooling rapidly on the Earth's surface at low pressure.

The glassy texture is the result of rapid cooling, which inhibits the growth of crystals. Obsidian was valued by the early civilizations of Mexico for making sharp-edged tools and ceremonial sculptures.
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? Mentioned in ? References in classic literature
 
Their weapons were bows and arrows; the latter tipped with obsidian, which abounds in the neighborhood.
The Adventures of Captain Bonneville, U.S.A., in the Rocky Mountains and the far West by Irving, Washington View in context
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