Anisotropy and Symmetry

A crystal property may, however, have intrinsic symmetry. Thus according to Friedei s law of diffraction (Section 3.7.3), the intensities hkl and hkfare approximately equal, even for a non-centrosymmetric crystal. The intrinsic symmetry of 

The origin of the anisotropic macroscopic properties of a crystal is its ordered microscopic structure, i.e. the crystal lattice which is demonstrated by the diffraction of X-rays. This order which gives rise to these very special effects has been characterized by W. Voigt Lehrbuch der Kristallphysik, 1910) in the following manner  

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