Tourmaline belongs to the gemstone Tourmaline is a kind of gemstone, a gemstone in the Tourmaline family and a borosilicate crystal. Tourmaline has various colors because it contains chemical elements such as aluminum, iron, magnesium, sodium, lithium and potassium.
The hardness of tourmaline is relatively high, about 7~8 degrees Mohs, completely transparent or translucent, and the crystal plane develops vertically. Moreover, the physical and chemical properties of tourmaline are also special, with polychromatic properties, and different colors can be seen from different angles.
In addition, tourmaline has good piezoelectric effect and thermoelectric effect. When tourmaline is heated or pressed, or rubbed by silk or wool, electrode effect will occur, and it can suck up dust and paper scraps, so it has good industrial use.