The calcium carbonate is soluble in some compounds such as acids, therefore many erosional structures such as calcareous caves, potholes, and deep valleys may be created. Some erosional features are known as karst. Although calcium carbonate is less resistant than igneous rocks, its resistance is higher than other sedimentary rocks. Usually, the Calcium carbonate is present in hills and sink hole structures, and often could be seen with other sedimentary rocks such as clay in different regions.

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Travertine is a kind of calcium carbonate with a compact strip structure that is created through water currents, especially the waterfalls and as well, hot and cold springs. Due to the chemical composition of calcite, the calcium carbonate in places with high values of evaporation leaves supersaturated solutions. Tufa is a porous travertine that could be found near waterfalls. Coquina is also a type of calcium carbonate rock with a weak structure; it is composed of shells and corals fragments.

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Pure limestone is often found in white and whitish colors. Due to the presence of impurities such as clay, organisms remains, iron oxide and other components, most of the limestone are found in different colors, especially if they are weathered. Based on their formation process, limestone could be seen in crystalline, clastic, granular or massive forms in nature. The presence of calcite, quartz, dolomite or barite crystals may create some small cavities in rocks. The Folk and Dunham classifications are used to scrutinize the limestone in detail.