When properties depend on orientation, the property is termed as anisotropic. Crystallographic anisotropy arises because of the crystallographic texture (preferred orientation of grains in a material). As we know, a single crystal is the most aniso­tropic. However, in polycrystalline materials, each grain tends to be oriented in dif­ferent ways, thus reducing the texture and thus anisotropy. However, polycrystalline materials can also become textured depending on the processing it undergoes. Yield strength may then be strongly dependent on crystalline texture. Polycrystalline materials with anisotropic crystal structure like HCP tend to have strong texture and thus mechanical anisotropy. One such example would be zirca — loy fuel cladding.