Graphite is a soft, crystalline form of elemental carbon. Graphite is a grey to black, opaque mineral with a metallic lustre. It occurs naturally in metamorphic rocks such as marble, schist, gneiss and phyllite. It is usually found as veins, lenses, and pockets and as thin laminae disseminated in metamorphic rocks. Depending on the mode of occurrence and origin, graphite is graded into three forms: flake, crystalline (lumpy) and cryptocrystalline (amorphous).
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