Shungite is a black, lustrous, non-crystalline mineraloid consisting of more than 98 weight percent of carbon. It was first described from a deposit near Shunga village, in Karelia, Russia, from where it gets its name. Shungite has been reported to contain trace amounts of fullerenes. 

“Shungite attenuates electromagnetic emissions from electrical grids, computers, cell-phones, Wi-Fi, appliances, and other electronic devices—meaning shungite transforms harmful manmade EMFs into wave forms that are more compatible with our biology.” It can purify water. This is all due to the crystal's carbon content.