Graphite or carbon fiber is generally considered inorganic as there is no hydrogen. The definition of organic is not precise but the purpose is to categorize things together that have similar properties. Carbon fibers behave like other inorganic fibers like fiberglass and alumina.
One other characteristic they mention is that inorganic fibers are uninflammable.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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