The introduction of tourmaline knowledge

In the eyes of people, tourmaline is a very cultural connotation of jade products. In very ancient times, tourmaline was used by upper class people. The tourmaline is the customary name of the gem industry in China. It belongs to the tourmaline family in the mineralogy, the tourmaline is a trigonal crystal system, and the crystal is a complex tri-column column. The colors are various, there are no colors, one kind of plant's flower red, magenta, red, blue, green, yellow, brown and black, among which the blue of the plant and the red color of the fresh plant are the highest ones. .

Tourmaline uses color, visibility, internal defects, and weight as the basis for evaluation and purchase. Note when purchasing: Tourmaline has a good degree of publicity, with a shiny glass appearance, uneven color of the same crystal, and less internal defects (inclusions and fissures). The tourmaline is brittle and should be worn when it is worn. The tourmaline-grade value of tourmaline is prolific in the nuclear part of the micro-plagioclase feldspar pegmatite, which is strongly albite and lithium-mica. From pegmatite in the state of Minas Gerais, Brazil. The tourmaline produced in Altay, Xinjiang, China is crystal clear, with a variety of colors, and there is a green watermelon tourmaline treasure.

The tourmaline has a shiny glass, transparent to translucent, with a strong multi-color. The tourmaline has piezoelectricity and thermoelectricity, which is also the origin of the tourmaline name. Similar to red tourmaline jewels are ruby, red spinel, spodumene, ochre topaz, red beryl, lavender crystal and so on. The gemstones that resemble the green tourmaline are diopside, emerald, and green beryl. Gemstones that resemble blue tourmalines have a blue spinel. The tourmaline is distinguished from it by the fact that there are distinct double shadows at the edges and corners of the tourmaline, and there are many gas-liquid inclusions and fissures, and the dichroism is strong and the visibility is good. The density and refractive index of the tourmaline are quite different, and the birefringence is large.