Chert is one of the important type of rocks. If we have to define Chert in general, Chert is a hard, dark, opaque sedimentary rock which is composed of silica with an amorphous fine-grained texture. Chert comes under Sedimentary Rocks. All Sedimentary Rocks have similar properties and formation process. Along with Chert Definition, know more about the History of Chert, Etymology of Chert in next sections.