The nature and structure of tourmaline: 
 Tourmaline is characterized by a kind of aluminum boron, sodium, iron, lithium-ring silicate mineral, the chemical formula for NaR3Al6 [Si6O18] (BO3) 3 (OH) 4. 
 Tourmaline its process name as "tourmaline", that gem tourmaline referred to as "tourmaline", tourmaline as colorful, transparent and perfect, and therefore loved by the people, ranking the list of mid-precious stones. 
 The color of tourmaline vary with the composition, iron-rich tourmaline and black, rich in lithium, manganese and cesium were pink tourmaline, also known as light blue; rich in magnesium often has brown and yellow tourmaline rich dark green chrome tourmaline. Tourmaline has a vitreous luster, no cleavage, 
 7.0-7.5 with a brittle hardness, specific gravity 3.03-3.25g/cm3, with piezoelectric and pyroelectric properties. Tourmaline crystals were columnar, rod-like aggregates were, radial, small needle-like, also showed a dense block or hidden in crystalline form. 
 I plant mainly black iron tourmaline tourmaline is mainly divided into the crystal form according to the shape (hexahedron structure) and loose fibrous two. 

 Tourmaline has a thermal resistance, piezoelectricity, spontaneous electrodes, infrared radiation, and other unique and important nature, can be widely used in electronics, chemical, environmental and human health and other fields.