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obsidian

noun
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obsidian

a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture

Synonyms:dark, ebony, raven
Antonyms:white

What Makes This Word Tick

Obsidian is a volcanic glass formed when lava cools rapidly. It's nature's way of saying, “Let's skip the usual rock-making steps.” Known for its dark, shiny surface, it has a unique beauty that implies power and mystery. The word obsidian brings to mind deep colors and sharp edges.