Marble belongs to the metamorphic group of rocks, which is one of the three primary types of rock-type groupings. The rock is created when limestone is subjected to high pressures and temperatures. The marble is formed because calcite materializes on the limestone, resulting in the creation of a more dense rock that contains roughly equigranular calcite crystals.
Pure marble can be white or even all black, but it can also form in a variety of colors because of the small number of impurities introduced with calcite during metamorphism. Marble is a hard rock with a granular texture that has a medium grain with visible calcite crystals. It has a gritty feeling when handled, and it is used in the construction of buildings, gravestones, monuments and pavement.