What is a sedimentary texture?      The term texture refers to the pattern formed within a sedimentary rock by the constituting grains. This can best be studied under a microscope. Classification of sedimentary texture      In sedimentary rocks of  Mechanical origin , formed by weathering, erosion, transportation, deposition followed by diagenesis & Lithification, the framework grains are joined together, either by finer fragmental particles or by chemically precipitated cement. The former is called  matrix  and the latter, c ement . The pattern formed by framework grains, matrix and cement is called (a) Clastic texture . Sandstones show this kind of texture.      The texture of a rock of  Chemical origin  is produced wholly by chemically precipitated materials. No inter-granular space is to be found in such a rock. Limestones of orthochemical origin show this kind of (b) Non clastic texture .    ...