There is a big difference between tourmaline and crystal. The gemstones divide it according to the crystal system. What kind of crystal system does tourmaline and crystal belong to? Here are the 7 crystal systems that we have compiled in Xiaobian. Go ahead and find the answer!
1. Cubic crystal system (equal crystal system)
Primary gemstones: diamonds, garnets, fluorite, sodalite, spinel, lapis lazuli.
2, tetragonal system
The main gemstones: zircon, square pillar stone, Fushan stone, cassiterite, rutile, scheelite.
3, hexagonal system
Primary gemstones: beryl, apatite, blue cone, fisheye, taffeta.
4, trigonal system
Primary gemstones: corundum, quartz, tourmaline (tourmaline), calcite, wollastonite, rhodochrosite, hematite.
5, orthorhombic system
The main gemstones: gold emerald, topaz, andalusite, cordierite, olive stone, zoisite, stubborn pyroxene, columnite, borologite, sillimanite, Saihuangjing, and chrysocolla.
6, monoclinic system
The chief gemstone: purple spodumene, moonstone, diopside, malachite, jadeite, serpentine, spodumene, vermiculite, epidote, and blue pillar.
7, triclinic system
Chief gemstones: sun stone, turquoise, rose stone, axe, labradorite.
From this crystal system division, it seems that crystal and tourmaline belong to the same crystal system. However, if we look carefully, we will find that the crystal name of the crystal is quartz, which belongs to the quartz group and belongs to the trigonal system from the crystal system. The tourmaline mineral name tourmaline belongs to the tourmaline family. From the crystal system, it belongs to the complex three-layered cone crystal, which shows that there is a substantial difference between the tourmaline and the crystal.
Tourmaline and crystal identification
There are many methods for the identification of gemstones. For more professional methods such as spectrometry, this is actually not used at all, so several simple identification methods are mentioned.
1, specific gravity liquid measurement
The specific gravity liquid is a well-mixed liquid with a certain density and can be used to quickly identify similar materials. For example, the proportion of tourmaline is 3.06, and the specific gravity of crystal is 2.56. When using bromoform with a specific gravity of 2.90, the tourmaline will sink to the bottom and the crystal will float.
However, this method can only be used to identify bare stones, and is often used for large-scale identification, and the specific gravity liquid is often a toxic or highly reactive liquid in the air, so it is not necessary to use this method for non-professionals.
2, look!
Tourmaline has very severe birefringence and pleochroism, which can be observed with the naked eye. Including clarity, because the amount of inclusions in the tourmaline has a serious impact on its value. Putting the bare stone on the cross like this, you can see the two refracted paths. This phenomenon is called birefringence. Other single-refraction gemstones such as spinel can be easily identified by this method.
3, thermoelectricity
Since it is also called tourmaline, thermoelectricity and piezoelectricity are the most typical characteristics of tourmaline. This method of identification is also quite simple, as long as you make some small powder, and then see if the tourmaline has the effect of adsorbing it. This actually makes me feel very easy, and even the gemstones that have been set can be used.
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