The crystalline form of carbon has a definite structural arrangement, but non-crystalline does not.
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Atoms in the non-crystalline form are arranged randomly without any fixed pattern or shape. This form is also called an amorphous form of carbon.
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Crystalline form eg., Diamond, Graphite, Fullerene, Buckyballs, Carbon Nanotubes, etc.
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Non-crystalline eg., Coal, Coke, etc.
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