Tourmaline, the piezoelectric effect and thermoelectric effect when tourmaline after heating or pressure, or use silk or blank to be friction, the two ends will have a columnar tourmaline electrode effect, to end positively charged, negative for the other side, Tourmaline will be some dust or small Zhixie attracted to the magical power of tourmaline is the piezoelectric effect and thermoelectric effect, is "tourmaline" the origin of the name. There was a interesting story: Legend of 1703, a warm summer in the Netherlands in Amsterdam, a few children playing in the Netherlands, sailing back to the stone. Suddenly, a child found that these stones, nearly all the dust and Caoxie absorption of the past. Children very surprised, Pianjiao their parents, really found this stone to attract or exclude light objects, such as dust and Caoxie, etc.. Since then, the Dutch call it "absorption Huishi," and was used to clean up breathing tube in the ash.
Tourmaline, the cat's eye effect will be within the tourmaline crystals are rich in gas-liquid inclusions, and often were targeted distribution, formation of tubular inclusions, tubular package-intensive experience makes processed into shape or Yuanzhu Globoidal like a cat's eye effect tourmaline -- Bi Yuxi, in the surface appear bright with a clear, but with the observation of the different point of view, the bright band also will change.
Identification of tourmaline, tourmaline the rich color and magic effects, tourmaline jewelry made of today's popular become the first choice of jewellery ornaments. But how to carry out the identification and tourmaline buy it » And red tourmaline gemstones are similar to the ruby, red spinel, spodumene, red light topaz, red beryl, light purple crystal, and so on. And green tourmaline gemstones are similar to diopside, emerald, green beryl. And blue gemstone tourmaline similar to a blue spinel. In addition, the glass imitation is also easy to confuse with tourmaline one of the species. 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.