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| Graphite |
| Graphite,archaically referred to as Plumbago, is a crystalline form of carbon, a semimetal, a native element mineral, and one of the allotropes of carbon. Graphite is the most stable form of carbon under standard conditions. Therefore, it is used in themrmochemistry as the standard state for defining the heat of formation of carbon compounds. Graphite may be considered the highest grapde of coal, just abover anthracite and alternatively called meta-anthracite,although it is not normally used as fuel because it is diffcult to ignite.
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