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obsidianite

American  
[uhb-sid-ee-uh-nahyt] / əbˈsɪd i əˌnaɪt /

noun

  1. Also called helenite.  a glassy gemstone made by melting volcanic ash and rock and then rapidly cooling it before it can crystallize: a form of obsidian produced artificially in various colors, including green, red, and blue, as determined by other trace minerals combined with it.

  2. Rare.  a tektite.

Etymology

Origin of obsidianite

First recorded in 1895–1900

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.