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石墨存在形式
Form of graphite
碳的存在形式是多种多样的，有晶态单质碳如金刚石、石墨;有无定形碳如煤;有复杂的有机化合物如动植物等;碳酸盐如大理石等。单质碳的物理和化学性质取决于它的晶体结构。高硬度的金刚石和柔软滑腻的石墨晶体结构不同，各有各的外观、密度、熔点等。
There are various forms of carbon, such as crystalline carbon such as diamond and graphite; amorphous carbon such as coal; complex organic compounds such as animals and plants; carbonate such as marble. The physical and chemical properties of carbon depend on its crystal structure. The crystal structure of diamond with high hardness is different from that of graphite with soft and greasy texture, each of which has its own appearance, density, melting point, etc.