marble

A metamorphic rock formed by alteration of limestone or dolomite, often irregularly colored by impurities, and used especially in architecture and sculpture.

A piece of this rock.

A sculpture made from this rock.

Something resembling or suggesting metamorphic rock, as in being very hard, smooth, or cold.

A small hard ball, usually of glass, used in children’s games.

Any of various games played with marbles.

Common sense; sanity.

Marbling.