obsidian

Plural: obsidians

Noun

• A hard, dark, glass-like volcanic rock.
• acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
• A type of naturally occurring black glass produced by volcanoes.
• A slightly bluish black, the color of obsidian glass.

Adj

• Black.

Examples

• The dark tiles on his rack felt as dense and unyielding as obsidian.

Synonyms

obby