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What are the difference between the Properties of Diamond and Graphite?

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Comparison of the Properties of Diamond and Graphite

Diamond Graphite
It occurs naturally in free state. It occurs naturally and is manufactured artificially.
It is the hardest natural substance known. It is soft and greasy to touch.
It has high relative density (about 3.5). Its relative density is 2.3.
It is transparent and has high refractive index (2.45). It is black in colour and opaque
It is non-conductor of heat and electricity. Graphite is a good conductor of heat and electricity.
It burns in air at 900°C to give CO2. It bums in air at 700-800°C to give CO2.
It occurs as octahedral crystals. It occurs as hexagonal crystals
It is insoluble in all solvents. It is insoluble in all ordinary solvents.

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