'This mineral is the most stable form of carbon, though not when you sharpen your pencil too fine'
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CARBON: This mineral is the most stable form of carbon, though not when you sharpen your pencil too fine
This mineral is the most stable form of carbon, though not when you sharpen your pencil too fine
This mineral is the most stable form of carbon, though not when you sharpen your pencil too fine
CARBON
Graphite
CARBON