Many friends often confuse the tourmaline with the crystal. Today, Xiaobian will help you distinguish between these two things. If you don't understand, if you buy the jewelry, if it is the same thing, but the materials used are different, how can you distinguish the two? Let's take a look at it.
What is tourmaline
Tourmaline, also known as tourmaline, is the English name Tourmaline, derived from the ancient Tunga Luo (Ceylon) word Turmani, meaning "mixed gems."
What is crystal
Rock crystal, a rare mineral, a kind of gemstone, quartz crystal, belongs to the quartz family in mineralogy, the main chemical component is silica, and the chemical formula is SiO2. When it is pure, it forms a colorless and transparent crystal. When it contains trace elements such as Al, Fe, etc., it is purple, yellow, brown, etc., and irradiates trace elements to form different types of color centers, which produce different colors, such as purple, yellow, brown, Pink and so on. Containing accompanying stones is called inclusion crystal, such as hair crystal, green ghost, etc., the inclusions are rutile, tourmaline, actinolite, mica, chlorite and so on.
The difference between tourmaline and crystal:
1. Tourmaline - Tourmaline
Chemical formula: Na(Li,Al)3Al6(BO)3Si6O18(OH)4
Crystal system: Trigonal system
Hardness: 7-7.5
Proportion: 3.06
Refractive index: 1.62-1.67
Polychromaticity: dichroism
2, crystal - quartz (monocrystallinequartz)
Chemical formula: SiO2
Crystal system: Trigonal system
Hardness: 7
Specific gravity: 2.56-2.66
Refractive index: 1.544-1.553
Polychromism: none
3, from the above data, we must see that 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 the largest 2.66, it is not difficult to see that the proportion of tourmaline is The crystal is much bigger.
4, in one is a more professional identification method, using two-color mirror detection. 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.
5, in a night from the refractive index can be judged whether it is tourmaline, the refractive index of tourmaline is between 1.62-1.67, the maximum refractive index of the crystal is 1.55, the gloss does not look like the color of the tourmaline.
6. The chemical composition of the two is also different. Tourmaline is a complex silicate. Crystal is a colorless and transparent large quartz crystal mineral. The main chemical component of crystal is silica. When the crystal of silica is perfect, it is crystal. After silica gelation and dehydration, it is agate. The silica hydrogel is solidified and becomes opal. When the silica grain is less than a few microns. It forms chalcedony, vermiculite and secondary quartzite.
7. Due to the complex chemical composition of tourmaline, there is 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.
In the above introduction, we basically answered the basic knowledge about tourmaline and crystal, so that everyone has a simple impression of these two things. I hope that through the above introduction, everyone can learn how the difference between tourmaline and crystal is.
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