One extreme case is a complete lack of texture: a solid with perfectly random crystallite orientation, which ulualy pink or purple with yellow extreme is a perfect single crystal, which has anisotropic properties by geometric necessity.
One extreme case is a complete lack of texture: a solid with perfectly random crystallite orientation, which will have isotropic properties at length scales sufficiently larger than the size of the crystallites. The opposite extreme is a perfect single crystal, which has anisotropic properties by geometric necessity.