Like marble, granite is also a natural stone with many colors. However, the similarities stop here. Unlike marble, granite is composed of different materials with different properties. Granite is chiefly composed of 30% Quartz and 60% Feldspar. These minerals are much harder than the calcite of marbles and for this reason granite will not scratch as easily as marble. Granite is very resistant to most acids and will not etch nor leave a dull spot on the surface, as marble does. Hydrofluoric acids, however, found in products such as rust removers, will mar the surface of Granite. Granite contains crystals, which are very distinct, appearing like small to medium stones compacted together. There are some exceptions, such as Blue Azul will have a vein like pattern, but if you look closely, the vein will also have small distinct crystals.