Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Marble may be foliated. In geology the term "marble" refers to metamorphosedlimestone, but its use in stonemasonry more broadly encompasses unmetamorphosed limestone. Marble is commonly used for sculpture and as a building material.
Marble is a rock resulting from metamorphism of sedimentary carbonate rocks, most commonly limestone or dolomite rock. Metamorphism causes variable recrystallization of the original carbonate mineral grains. The resulting marble rock is typically composed of an interlocking mosaic of carbonate crystals. Primary sedimentary textures and structures of the original carbonate rock (protolith) have typically been modified or destroyed.
Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone or dolomite protolith. The characteristic swirls and veins of many colored marble varieties are usually due to various mineral impurities such as clay, silt, sand, iron oxides, or chert which were originally present as grains or layers in the limestone. Green coloration is often due to serpentine resulting from originally magnesium-rich limestone or dolostone with silica impurities. These various impurities have been mobilized and recrystallized by the intense pressure and heat of the metamorphism.
Marbleizing is a difficult technique to convincingly master. However, concrete acid stain possesses the unique property of creating a marble-like effect without any additional staining techniques. Particularly on older concrete slabs exposed to the elements, the variable porosity of the slab allows the stain to penetrate to different depths, creating natural areas of light and dark staining. If you want to try an additional marbleizing effect, layering diluted acid stains will give additional depth to the stained concrete.
When choosing countertops for your kitchen or bathroom, granite and marblesurfaces are popular choices. They are natural stones — unlike, say, engineered quartz silestone — so both marble and granite surfaces are susceptible to chipping and staining. However, granite is more durable than marble and less prone to stains and scratching. For this reason, granite is often found in kitchens, while marble is more common in other areas, like bathrooms.