Assorted size tumbled Shungite.
Note that this is regular grade Shungite, it is not Noble nor Elite Shungite.
Black Shungite or Petrovsky Shungite contains 75-50% carbon; it has a deep black color, similar to coal. Black Shungite is industrially mined, and due to its composition – carbon, other minerals, and chemical elements – can be cut in various shapes and polished.