fullerenesThe term "shungite" was originally used in 1879 to describe a mineraloid with more than 98 percent carbon. More recently the term has also been used to describe shungite-bearing rocks, leading to some confusion.[3] Shungite-bearing rocks have also been classified purely on their carbon content, with Shungite-1 having a carbon content in the range 98-100 weight percent and Shungite-2, -3, -4 and -5 having contents in the ranges 35-80 percent, 20-35 percent, 10-20 percent and less than 10 percent, respectively.[3] In a further classification, shungite is subdivided into bright, semi-bright, semi-dull and dull on the basis of their luster (the terms lustrous and matte are also used for bright and dull