Shungite is a rare mineraloid with a unique chemical composition, and such a rare occurrence in nature I would dare saying its out of this planet!.
The Fullerene in Shungite is only found in meteorite fragments, at the K-T boundary (the Iridium layer that marks the extinction event at the end of the Cretaceous), and through chemical reactions (in soot, or during lightning strikes against organic soil). And, also fascinating, it has a very complex structure composed by one single element: carbon.