obsidian

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• January 15. 2013 from WordNet.dk

  obsidian — noun — danish

  sort, vulkansk glas dannet ved hurtig afkøling af ... : Smykkerne er lavet af bjergkrystal og af obsidian

  • Discipline: geologi
  • Generalization: glas

• March 1. 2016 from wordnet.princeton.edu

  obsidian — noun — english

  acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces