Marble has a consistent texture (non-foliated). Marble comes in a wide range of colors and textures. The kind of limestone that makes up the parent rock, as well as the type and degree of metamorphism, are the two key impacts. It may be almost any hue, such as white, black, red, green, and others. The color comes from minerals within the stone itself; the amount of brown or gray in the stone shows how much iron is present. The most common types of marble are white, black, and red. Other colors can be found, but they are less common. White marble is made up of calcium carbonate (the same compound as chalk), with some magnesium and iron oxides mixed in. Black marble contains more iron oxide than white marble, so it's darker and sometimes referred to as "dark grey." Red marble is made up of the mineral cinnabar (a mixture of mercury and arsenic sulfide) which gives it its bright red color. There are three main types of marble processing: raw, cut-and-polished, and molded. Raw marbles are simply polished blocks of stone that are ready to use as countertops or flooring. Cut-and-polished marbles have their natural shape retained after processing, while molded marbles have their form created during the manufacturing process. Both cut-and-polished and molded marbles are used for decorative purposes only, although molded marble is usually cheaper than cut-and-polished.