Many unprofessional merchants in the market sell some low-end tourmalines and crystals together, introducing that tourmaline is a kind of crystal. Many people think that tourmaline is a kind of crystal that is not expensive. In fact, this is not true. Tourmaline and crystal are two different minerals. In the jewellery world, tourmaline is a medium-to-high-end gemstone, and high-quality tourmalines are rarer than diamonds. Crystal is a general gem.
How to distinguish between tourmaline and crystal
1. Tourmaline is also called tourmaline, chemical formula: na (li, al) 3al6 (bo) 3si6o18 (oh) 4, and crystal-quartz (monocrystallinequartz) chemical formula: sio2, which shows that the chemical composition of the two Unlike the tourmaline, which is a complex silicate, the crystal is a colorless and transparent large quartz crystal mineral.
2. The main chemical component of crystal is silica. When the crystal of silica is perfect, it is crystal. After silica gelation, it is agate; the colloid of silica contains solid opal and becomes opal; the silica grain is less than a few. When it is micron, it forms chalcedony, vermiculite and secondary quartzite. However, due to the complex chemical composition of tourmaline, there is no synthetic tourmaline.
3. Since the refractive index of tourmaline is between 1.62-1.67, the refractive index of crystal is only 1.55, so the crystal luster does not look like the color of tourmaline.
4. The color of tourmaline is also much richer than crystal, subdividing as many as 15 kinds of complex colors.
5. Tourmaline is piezoelectric and pyroelectric, that is, the rubbed tourmaline can absorb small pieces of paper and dust, and crystal has no such effect.
6. The hardness of tourmaline is higher than that of crystal, so you can know who is harder by using tourmaline and crystal to draw glass.
7. The ratio of tourmaline is more important than crystal, and the weight is judged from the hand.
8. Crystal and tourmaline originally had a very different proportion from the proportion. The proportion of tourmaline is 3.06 and the proportion of crystal is 2.66. It is easy to see that tourmaline is much larger than crystal.
9. In one is a more professional identification method, using a dichroic mirror. This method can be seen at a glance that those are crystals, which are tourmalines. Tourmalines are pleochroic. It is very simple to say that the color of the tourmaline has a transitional color, and many parts of the crystal have no transitional color, except for the ametrine. Outside the special crystal.
Due to the complex chemical composition of tourmaline, there is currently no synthetic tourmaline. Synthetic crystal jewelry is available in many markets. In 1768, the famous Swedish scientist Linnes discovered that the tourmaline is piezoelectric and pyroelectric, and the mineralogical name is "tourmaline". Crystal has no such effect. The color of the tourmaline is also much richer than the crystal, subdividing as many as 15 kinds of complex colors. The hardness of tourmaline is also higher than that of crystal, and the magnetic field of tourmaline is several dozens to hundreds of times of the same color crystal.
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