A dolostone or dolomite rock is a former limestone wherein the calcite is replaced by dolomite, according to About.com. Geology.com states that this is a type of sedimentary rock found in sedimentary basins all over the world.
Dolostone and limestone have many similarities. Both types of rock have the same color ranges of white-to-light brown and white-to-gray. Other colors, including green, black and red, can occur. Additionally, both types of rocks are similar in terms of hardness, and both of them can be dissolved in dilute hydrochloric acid. Dolostone can be crushed and used for construction purposes and to neutralize acids.