A carbonate sedimentary rock that is crystalline in form and generally light colored. Dolostone is often found in montane areas or alluvial plain. The main feature of dolostone is that it is composed of (or contains a large proportion of) calcium-magnesium carbonate (dolomite), that distinguishes it from limestone which is predominantly calcium carbonate.
CaMg(CO3)2 A sedimentary rock that is usually formed by the alteration of preexisting limestone. Typically magnesium bearing fluids interact with the limestone and alter its structure, forming the mineral dolomite. Unlike limestone, dolostone will react only weakly with dilute acid.
Dolostone is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite. It is usually referred to as dolomite rock. In old U.S.G.S. publications it was referred to as magnesian limestone.