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Graphite, also known as carbon plumbago or black lead, mineral that is the crystalline form of carbon. Graphite is a good conductor of electricity and is used to make electrodes. Its inertness makes it valuable for the construction of metallurgical crucibles. It is also used as a lubricant, a moderator in nuclear reactors, and, mixed with clay, becomes the “lead” of pencils.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Grand Rapids to Hadron