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It primarily consists of calcite, clay minerals, mica, quartz, pyrite, iron oxides, and graphite in its composition. The recrystallization of calcite in limestone forms a rock with interlocking calcite crystals. A related rock called the dolomite marble is formed when the dolostone is exposed to heat and pressure. Recrystallization of the rock changes the texture of the rock. It is a light coloured rock formed from limestone. There are different types of marble depending on the nature of the impurity. Marble with impurities can appear bluish, gray, pink, yellow, or black in colour. A pure calcite marble is white, whereas hematite is red, one withlimoniteis yellow, and serpentine is green.