noun
EXAMPLES FROM CORPUS
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A glass tide tinkled on the hull of the receiver, its echoing obsidian .
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A glassy stone beloved by ancient toolmakers, obsidian was found only in two prehistoric spots in Arizona prior to the 1980s.
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A plain black obsidian which the Minoan craftsmen tried may have come from the Siftlik area of Cappadocia.
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For example, many early human artifacts, such as arrowheads, are made of obsidian , a volcanic glass.
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I had a friend send me some obsidian blades.
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Pre-Columbian cultures in the New World did sophisticated operations, including skull surgery, with obsidian , he added.
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Unlike most volcanic rocks, obsidian does not contain phenocrysts; it is, so to speak, all glassy groundmass.
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Walls, ceilings, floors were clad in smooth obsidian and jet carved with runes, sacred hexes and texts.