obsidian

[uhb-sid-ee-uhn]
noun
a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture.

Origin:
1350–1400; < Latin Obsidiānus, printer's error for Obsiānus pertaining to Obsius, the discoverer (according to Pliny) of a similar mineral in Ethiopia; replacing Middle English obsianus < Latin; see -an

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World English Dictionary
obsidian (ɒbˈsɪdɪən)
 
n
Also called: Iceland agate a dark volcanic glass formed by very rapid solidification of lava
 
[C17: from Latin obsidiānus, erroneous transcription of obsiānus (lapis) (stone of) Obsius, the name (in Pliny) of the discoverer of a stone resembling obsidian]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

obsidian
1656, from L. obsidianus, misprint of obsianus (lapis) "(stone) of Obsius," a Roman alleged by Pliny to have found this rock in Ethiopia.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
obsidian   (ŏb-sĭd'ē-ən)  Pronunciation Key 
A shiny, usually black, volcanic glass. Obsidian forms above ground from lava that is similar in composition to the magma from which granite forms underground, but cools so quickly that minerals do not have a chance to form within it.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
You're always cogent, but that one was honed to obsidian sharpness.
The new red shirt has a sash with a color called obsidian blue.
Cut marks on the protruding neck bones probably indicate the head had been severed by a sharp obsidian knife.
When obsidian breaks it fractures with a distinct conchoidal fracture.
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