a) Clastic(terrigenous/detrital) sedimentary Rocks Derived from pre-existing rocks. Composed of physically derived components. Sometimes referred to as extrabasinal. Grains are mechanically durable and chemically stable. Clasts are made of quartz, feldspar, muscovite, clay minerals, and rock fragments. Silica(Sio2) is the major component. Classified based on texture(grain size). Examples: breccia, conglomerate, sandstone, siltstone, and shale.