obsidian
1. obsidian, vulkansko steklo
a kind of natural glass produced when molten lava cools very rapidly [vrsta naravnega stekla, ki nastane, ko se vroča lava hitro ohladi]
2. obsidian
acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces [Kislo ali granitno steklo, oblikovano z hitrim hlajenjem lave brez kristalizacije; običajno temno, vendar prosojno v tankih kosih.]
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