All about Tourmaline Gemstone It is the hard stone having the hardness of 7-7.5 Mohs and could be used for wearing daily in earrings, rings or pendants. However, in order to endure years of wear keep it away from steam cleaning, home ultrasonic clean

The tourmaline mineral group is chemically one of the most complicated groups of silicate minerals. Its composition varies widely because of isomorphous replacement (solid solution), and its general formula can be written as XY3Z6(T6O18)(BO3)3V3W, wh