LIMESTONE : /ˈlīmˌstōn/
1. a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, commonly used as building material.
MARBLE : /ˈmärbəl/
1. a hard crystalline metamorphic form of limestone, typically white with mottlings or streaks of color, that is capable of taking a polish and is used in sculpture and architecture.
