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.

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The calcium carbonate is a sedimentary rock which is mainly composed of calcite mineral (calcium carbonate: CaCo). The calcium carbonate is often composed of various quantities of silica mineral in the form of chert or flint, as well as various amounts of clay, silt, and sand, as intercalations, nodules or interbedded layers. The main source of calcite in limestone is usually marine organisms, so that their shells deposit on the ocean floor. As well, the secondary calcite may be deposited by supersaturated meteoric waters (ground waters that cause the deposition in caves), and consequently cave deposited layers such as stalagmite and stalactite are formed.

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.

ساختار اندام دام دارای ذخایری از منیزیم است. که بخش عمده ای از آن در است.خوان های مهره ها و دنده نگهداری می شود. و هنگامی که در دام ها کمبود منیزیم اتفاق می افتد،به منظور جبران آن از ذخیره منیزیم است.خوان‌هایشان است.فاده می‌کنند. که این حالت در دام های جوان اتفاق می افتد  در حالی که دام های بالغ به علت کمبود منیزیم در اثر بروز Tetany تلف می شوند.