Shear (geology)
（重定向自Shear fault）
![Boudinaged quartz vein(with strain fringe) showing sinistral shear sense, Starlight Pit, Fortnum Gold Mine, Western Australia](/Images/godic/202502/10/Boudin_vein3741.jpg")
![Asymmetric shear in basalt, Labouchere mine, Glengarry Basin, Australia. Shear asymmetry is sinistral, pen for scale](/Images/godic/202502/10/Asymmetric_shear3741.jpg")
![Dextral slickenside of pyrite](/Images/godic/202502/10/PySlick3742.JPG")
![Typical example of dextral shear foliation in an L-S tectonite, with pencil pointing in direction of shear sense. Note the sinusoidal nature of the shear foliation.](/Images/godic/202502/10/Geological_shear_r3742.jpg")
Shear is the response of a rock to deformation usually by compressive stress and forms particular textures. Shear can be homogeneous or non-homogeneous, and may be pure shear or simple shear. Study of geological shear is related to the study of structural geology, rock microstructure or rock texture and fault mechanics.