Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is primarily composed of the mineral calcite (CaCO3) and usually contains other minerals such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite

. Metamorphic rocks, such as marble, are rocks that have undergone a change in composition due to intense heat and pressure

. This process results in the characteristic interlocking mosaic of carbonate crystals that gives marble its unique appearance