Dolostone is a type of sedimentary rock primarily composed of the mineral dolomite, which is a carbonate mineral made up of calcium magnesium carbonate. It typically forms from the alteration of limestone through a process called dolomitization, where magnesium-rich fluids replace some of the calcium in the limestone. Dolostone can vary in color, often appearing gray, brown, or white, and is commonly found in sedimentary basins. This rock is significant in geology and is often used in construction and as a source of magnesium. Dolostone can also serve as a reservoir rock for oil and natural gas, making it important in the energy industry. Its unique properties make it valuable for various industrial applications.