Tourmaline, in the identification of critical attention to the following:
1) tourmaline density (3.06), hand-weigh than crystal, glass was heavy to some;
2) rich color. Tourmaline color is the most abundant species of precious stones, crystal, the same can be different colors such as yellow and green, pink and yellow, red and blue, and so on;
3) multicolor markedly. In the transmission of light under different angles Cha Tourmaline, the color hue and brightness level will be any change, and Zi Jing was not obvious, glass will not be there;
4) obviously birefringence ghosting effect. Tourmaline, the refractive index of 1.616-1.650, double refractive index up to 0.044, using the magnifying glass through the observation of tourmaline crystals, the back-row of carved and impurities will be apparent ghosting effect;
5) electrostatic effect. Tourmaline, a thermoelectric effect, the friction heat after absorption from the small dust and Zhixie;
6) inclusions. Tourmaline 's internal inclusions frequently targeted the line, tubular vapor-liquid inclusion, crystal, topaz, and so while irregular points, plumes inclusions in the majority; glass bubbles will appear, the vortex profile.
7) growth profile. For natural tourmaline crystals, Globoidal triangles and cylindrical parallel cylindrical extension of the direction of its growth profile is different from Crystal, the main features of Beryl.