What Is the Appearance of Limestone?

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One way that limestone's appearance differs from other natural stones is in its pattern. While marble is marked by veins and granite by a crystalline structure, limestone is studded with fossils. Limestone is created out of a shell bed or reef in or near the ocean. Thousands of fossils ranging from the size of a pin to the size of an apple can be found embedded in the stone. Some limestones such as Cafe Pinta are known for the extreme fossilization, while others have only a few. Dirty limestone, or limestone that has been subjected to other minerals and dirt or mud, may also show waves of darker color. These waves may have an appearance similar to sand or mud.