Marble belongs to metamorphic rocks formed as a result by recrystallization of carbonates (carbonaceous compounds) more than 2.5-4 billion years ago under influence of high temperatures and pressure. In process of recrystallization in metamorphic marbles, as a rule, all traces of original clastic grains or fossilized organic destroyed residues. The composition of marble doesn't change with metamorphism. Initial carbonate rocks for formation marble, as a rule, in most cases are limestone or dolomite. Accordingly, marble consists of calcite (calcium carbonate), or dolomite (calcium and magnesium carbonate), or both minerals.
Marble can be white or colored: pink, yellow, gray, blue, greenish, reddish, black, brown, as well as various combinations of these colors are inherent in marble. Often, workers find different shade of color in one deposit. Various shades of marble arise due to content of more or less oxides various metals and graphite. Colored marble is characterized by presence of veins, which cracks filled with natural cements. These veins can form an original pattern. The most valuable type of marble is pure, white statuary marble, for making sculptures.