This is a large piece (weighing approx. 440 grams).  It is a lovely smooth peice of Tourmaline.
 
Black tourmaline is a favorite among people working with crystals and energy healing because it is so effective at both grounding and clearing.
 
Technically there is no such thing as “negative energy”, but that term is still used as a shorthand for negative patterns, intention, and emotions that can build up in your auric field. Black tourmaline can transmute this negativity, freeing up the energy involve to be used for positive ends.
 
We also have smaller pieces, perfect for placing around your large windows and doorways.