Limestone is a sedimentary rock containing at least 50% of mineral calcite (calcium carbonate, CaCO3) and additional compounds such as: dijaspor, zircon, clay, limonite, hematite, hydrargillite, flintstone, turmaline, sporogelite and granate (and somewhere gramite). Limestone emerged from the sedimentation of shells and skeletal fragments, and sometimes even herbal particles. Pure limestone is white in color. Limestone is composed of very small opaque crystal grains invisible to the naked eye. If containing iron minerals limestone becomes yellowish or reddish, however, coal particles give it dark gray to black color. It easily enters chemical reactions caused by atmospheric factors, it is soluble in water but other insoluble minerals remain at the surface composing ‘terra rossa’ (red soil). Solution of limestone gives cause to numerous characteristic features of Karst such as cracks, karst sinkholes, caves, etc. In nature it can be found as the most frequent component of sedimentary rocks that originate from alluvial sediments containing shells of microscopic protozoa. Of course, the process of sedimentation occurred during vast period of time.