Considered one of the most protective crystals to own, Schorl, also known as Black Tourmaline is a grounding stone which will help shield you from negative energy and psychic attacks, whilst bringing relief to a troubled mind.
 
Black tourmaline offers EMF protection and is also said to be helpful with overall healing and mental health.
These pieces measure approximately 10cm each and would be beneficial if placed on a nightstand, as Black Tourmaline can also assist with sleep.