Randomly oriented microstructure of graphite

Carbon materials can also be classified in other ways, such as stacking methods, crystallinity, and structural symmetry. From the viewpoint of crystallinity, carbons can be classified as crystalline or amorphous. From the point of view of stacking methods, carbon structures can be classified as graphite, glassy carbon, carbon fiber, and carbon black. From the point of view of symmetry of the microstructure, carbons can be classified as randomly orientated or having point symmetry, axial symmetry, or planar symmetry (Figure 7.3) [2]. 

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