Oolite is one of the important type of rocks. If we have to define Oolite in general, Oolite is a sedimentary rock formed from ooids, spherical grains which are composed of concentric layers of calcite. Oolite comes under Sedimentary Rocks. All Sedimentary Rocks have similar properties and formation process. Along with Oolite Definition, know more about the History of Oolite, Etymology of Oolite in next sections.