Shungite is a black stone made from mainly carbon.  The carbon makes it unusually lighter then most other crystals and also gives it a metallic black colour.
Shungite is a great purification crystal and also has healing and grounding properties.  It has been used to improve health and is still used in elixirs and potions today.  
It can also be used to amplify psychic power and cloaks you from bad energy.
10mm beaded bracelet.