Granite: a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone. I saw granite.
Part of speech: noun
Limestone:a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement. Limestone is a rock.
Part of speech: noun
Marble: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. The table is made of marble.
Part of speech: noun