Obsidian

Definitions

1. A type of naturally occurring black glass produced by volcanoes.
   uncountable, usually
2. A slightly bluish black, the color of obsidian glass.
   uncountable, usually

Equivalents

Examples

“The Neolithic culture from 8000 to 6000 B.C., however, was a brilliant period of the revival of crafts, the transformation of gathering into gardening, the growth of a cross-cultural obsidian trade⟳, and the rise⟳ of towns.”

CEFR level