obsidianite

[uhb-sid-ee-uh-nahyt]

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.

Word History and Origins

Origin of obsidianite¹

First recorded in 1895–1900