Texture in geology refers to the physical appearance or character of a rock, such as grain size, shape, and arrangement, at both the megascopic or microscopic surface feature level. This includes the geometric aspects and relations amongst the component particles or crystals which is called the crystallographic texture or preferred orientation. The term structure is generally used for larger features. World geologic provinces Oceanic crust  0-20 Ma  20-65 Ma  >65 Ma Geologic provinces  Shield  Platform  Orogen  Basin  Large igneous province  Extended crust Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason))[1] is the science and study of the solid matter of the earth, its composition, structure... In materials science, texture is the distribution of crystallographic orientations of a sample. ... Look up Structure in Wiktionary, the free dictionary. ...