Shungite - Shields against Electromagnetic Frequencies

If you've never heard of shungite, you might want to consider adding it to your crystal collection. It's a powerful grounding stone, among its other benefits, and its rich, black color makes it stand out among colorful crystals.
Author of Crystals for Healing Karen Frazier notes that shungite is extremely grounding and that it's also believed to help shield you from electromagnetic frequencies.
 
Size:   between 2 - 3cm