A central problem in the investigation of material properties involves the examination of the underlying blocks that aggregate to form macroscopic bodies. These underlying blocs own a definite arrangement that is repeated in three dimensions to give the crystal structure. We will try to explore the geometry of some well known class of materials (e.g., diamond, zinc-blende, wurtzite etc,) and learn techniques of identifying planes (Miller indices) and directions in these crystal structures. Finally, we will see that the crystals are provided with a certain symmetry which is reflected in their physical properties.
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