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A soft limestone formed primarily of broken shells and coral; cut into blocks and used in construction.

A representation of the forms of seashells and the like, as a decorative carving.

A hammer having a long, curved, ball-shaped peen; used to beat copper sheeting into the desired shape.

Copper roofing material used to cover flat, domed, or sloping roofs; usually weighs from 1 €ž2 to 2 lb per

A flexible metal roof covering made of copper sheets, joined by seams. As the copper oxidizes, it develops a green

Depositing a protective layer of copper on the surface of another metal, either by the electrolytic method or by dipping.