The graphite crystals of natural flake graphite are scaly. They are transformed under high-intensity pressure and are divided into large-scale and fine-scale. It is one of the best flotation ore in nature, and high-grade graphite concentrate can be obtained through multiple grinding and selection. The floatability, lubricity and plasticity of this type of graphite are better than other types of graphite. Therefore, it has the greatest industrial value. The required pressure is usually greater than 1 gigapascal (75,000 psi), and the required temperature is usually greater than 750 degrees Celsius (1,380 F).
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