Marble is metamorphosed sedimentary carbonate rock. Limestone or dolomite (carbonate rocks) are the typical base minerals. The recrystallization of the carbonate minerals results in Marble.
Often, the original structure of the carbonate rocks are modified during the metamorphism to render the marble unrecognizable from its original state. The swirling and veins in marble often result from mineral impurities which are in layers in the original limestone or dolomite.
Galaxy Stone has some of the best marble slabs in Houston, and feel free to stop by our Houston stone showroom to get a closer look.