In the last century, Cocotohai, Fuyun County, Altay Prefecture, Xinjiang, was a high-producing area of tourmaline. Predatory exploitation leads to the exhaustion of resources, and most of the world is hidden.
Characteristics of tourmaline
Tourmaline Tourmaline is called tourmaline in English, which comes from the word "Turmali" in ancient Sinhalese, meaning "mixed gem". In some historical documents of our country, it is called arsenic, tourmaline, bixia stone, broken evil gold and so on.
Tourmaline crystal Tourmaline is a complex triangular columnar crystal, and there will be characteristic growth stripes on the surface of the crystal parallel to the extension direction of the columnar crystal. In cross section, it is a curved spherical triangle.
The color of tourmaline The color of tourmaline is the most abundant among all kinds of precious stones. Tourmaline belongs to a complex borosilicate mineral, and its chemical molecular formula is Na (Mg, Fe, Mn, Li, Al) 3L6 [Si6O 18] 3 (OH, F) 4, in which metal ions such as iron, magnesium, lithium, manganese and aluminum can be substituted for each other, and the different content of each ion will directly affect the different colors and types of tourmaline. Iron-rich tourmaline is dark green; Magnesium-rich tourmaline is yellow or brown; Tourmaline rich in lithium, manganese and cesium is rosy, pink, red or blue; Chromium-rich tourmaline is dark green. Among them, blue and bright rose tourmaline are top grades. In the same tourmaline crystal, the uneven distribution of components often leads to color changes, such as two-color tourmaline, multi-color tourmaline or watermelon tourmaline with infrared green inside.
In addition to its rich and colorful colors, tourmaline's polychromatic color is the most attractive thing. When we hold tourmaline and observe it from different angles against the rotation of light, the color, tone and depth of tourmaline will change with the change of observation angle. This is due to the strong multicolor of tourmaline, which also gives tourmaline a mysterious color.
Piezoelectric effect and thermoelectric effect of tourmaline When tourmaline is heated or pressed, or rubs against silk or wool, it will produce electrode effect at both ends of columnar tourmaline, with one end positive and the other negative, which will make tourmaline attract some dust or paper. This magical power is the piezoelectric effect and thermoelectric effect of tourmaline, which is also the origin of the name "tourmaline". There is an interesting story: it is said that in 1703, on a warm summer day in Amsterdam, the Netherlands, several children were playing with stones brought back by Dutch navigators. Suddenly, a child found that dust and grass clippings near these stones were sucked in. The children were surprised and called their parents to see it. Sure enough, they found that this stone can attract or repel light objects, such as dust and grass clippings. From then on, the Dutch called it a "dust stone" and used it to clean the soot in the pipeline.
Cat's Eye Effect of Tourmaline There are abundant vapor-liquid inclusions in Tourmaline crystals, which are often distributed directionally to form tubular inclusions. Dense tubular inclusions make tourmaline with arc or round beads have cat's eye effect-there are obvious bright bands on the surface of tourmaline, and the bright bands change with different observation angles.
Emerald dynasty
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Jewellery amusement park
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