Explain the method of visual identification of tourmaline
Tourmaline
Crystal
The three-square column, the complex three-square column, the three-sided single cone, the single cone is a spherical triangle, one end is developed, and the longitudinal surface of the crystal surface is obvious.
colour
Tourmaline is an unforgettable gem. It is a special color feature due to its mineral composition. It includes red, blue, green, yellow, purple, black, white, etc., and these colors can be combined arbitrarily. It constitutes the first impression of the colorful and dazzling tourmaline. The colors are diverse and evenly beautiful. The color of the tourmaline is diverse but not clear enough, calm and not sloppy, and has a feeling of oilyness.
Polychromaticity
Polychromaticity refers to the phenomenon that the color of a non-homogeneous colored gemstone changes with the direction of vibration of the light wave. Usually, the pleochroism of a gemstone can be observed by an optical instrument called a dichroic mirror, but the tourmaline is a Exceptionally, its pleochroism is very obvious, often without the use of dichroic mirrors, tourmaline is easy to see pleochroism.
When we hold the tourmaline to observe the light and observe it at different angles, the color tone of the tourmaline changes with the angle of observation. This is due to the strong pleochroism of the tourmaline, which includes the color of the tourmaline itself, as well as the color produced by its pleochroism. This is its most attractive and important feature, which is also the tourmaline. I have a mysterious color. Therefore, pleochroism is an important method to identify tourmaline.
Absorptive
The phenomenon in which the color of a gem changes as the direction of vibration of the light wave changes is called absorption. The tourmaline is very absorbent, and the change in the shade of the same shade is often observed in the vertical C-axis, ie, in the short direction. The color is deepened or even completely absorbed. It is black because the tourmaline absorbs light differently in different directions. The direction is different in the shade of the same color.
Thermoelectric effect and piezoelectric effect
After the tourmaline is heated or pressurized, it will generate electric charge at both ends of the columnar tourmaline. When one end is positive and one end is negative, voltage can be generated, and small paper dust or small dust can be sucked up. This magical effect is called thermoelectricity. Effect and piezoelectric effect. Of course, using silk or material friction can also produce the same effect, so when the current three methods can not be judged, it is helpful to try this method.
Ghost effect
The tourmaline has a high double-fold rate, so the tourmaline is easy to see the ghost. The condition is that the faceted tourmaline is transparent. Looking at the edge of the bottom edge of the tourmaline from the table top, the ridge line is two parallel, which is a ghost image of a ridge line. At the same time, if there is a wrap, there is also a significant ghost.
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