How to identify tourmaline

How to identify tourmaline? There are two types of common bicarris replicas, one is artificially colored with colorless tourmaline; the other is made of red glass. The method of identification is that the true tourmaline often has obvious dichroism, and the double shadow is visible. Let's take a look at the main points of identification.

How to identify tourmaline

In the identification of tourmaline, the key points are as follows:

1) The density of tourmaline is large (3.06)

The amount of hand rubbing is heavier than crystal and glass.

2) Rich in color

Tourmaline is one of the most colorful gemstones, and different colors can appear on the same crystal, such as yellow and green, pink and yellow, red and blue, and so on.

3) Obvious chromaticity

In the transmitted light, the tourmaline is observed at different angles, and its color tone and brightness are changed. The amethyst is not obvious, and the glass does not appear.

4) Obvious birefringence ghosting effect

The tourmaline has a refractive index of 1.616—1.650 and a birefringence of 0.044. The magnifying glass is observed through the tourmaline crystal, and the surface of the back face and the impurities will have a significant ghost effect.

5) Electrostatic effect

Tourmaline has a thermoelectric effect, which can pick up fine dust and paper scraps after friction.

6) Inclusions

The inner inclusions of tourmaline often have oriented linear and tubular vapor-liquid inclusions; crystals, topaz, etc. are mostly irregular spots and feather-like inclusions; glass will appear bubbles and swirls.

7) Growth pattern

For natural tourmaline crystals, the growth of the curved triangular cylinder and the parallel cylinder is the main feature distinguishing crystal and beryl.

To identify tourmaline, the methods described above are simple and effective. With this knowledge in mind, you don't have to worry about buying a tourmaline.

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