Black Tourmaline 5-10mm

Black tourmaline is an interesting energetic stone. Scientists worldwide have long been intrigued by the unique electrical and magnetic properties of tourmaline. American statesman and inventor Benjamin Franklin, possessed at least one tourmaline stone and is said to have used it in his experiments (he invented the lightening rod). In Europe in 1880, Pierre Curie and his brother Jacques, a mineralogist, discovered that tourmaline carries a weak electric charge when it is heated (pyroelectricity) or when pressure is applied to its surface (piezoelectricity). Later, research in Japan confirmed that tourmaline carries a faint but constant electric charge of 0.06mA, which is why tourmaline continues to be known as "the electric stone," especially in Asia. Japanese researchers also found that no matter how small tourmaline is ground or crushed, it is still capable of conveying an electric current.

This tourmaline is actually green tourmaline with a very high concentration of iron that turns it almost black.