Morphology and micro-fabrics of weathering features on gyprock exposures in a semiarid environment (Ebro Tertiary Basin, NE Spain)

► Gyprock weathering is recognized in the field and microscope with specific features. ► Specific microscopic features characterize the weathering on gyprock exposures. ► The growth of gypsum crystals inside gyprock cause its weathering. ► The gypsum crystallization pressure inside the gyprock increases its volume.