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jewel manufacturing What are the characteristics of tourmaline minerals?

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(1) Complex composition: Tourmaline is an extremely complex boro-aluminosilicate mineral, and it is the gem mineral with the most complex chemical composition in nature. It may contain one or several elements such as magnesium, sắt, lithium, potassium, sodium, vân vân. Due to the different content ratios of these elements, tourmaline often has different colors. Such as manganese, it can be red or pink tourmaline, chromium and vanadium can make the tourmaline appear emerald green, and iron and titanium can make the tourmaline black.

(2) The shape is simple: Tourmaline belongs to the trigonal crystal system, the crystal is long columnar or needle-shaped, and the two ends of the column are often different cones. The crystal plane often has vertical stripes. The cross-section of the crystal is an equilateral triangle, and each side of the triangle protrudes outward, so it is easier to identify.

(3) Variety of colors: Tourmaline is the most colorful gemstone. It can have colors such as colorless, hồng, màu đỏ, màu xanh lá, màu xanh da trời, màu vàng, và màu nâu. Sometimes the same crystal can appear in multiple colors, or in the same crystal. The ends have completely different colors, vì vậy nó được gọi là “multicolor tourmaline”.

(4) Other properties: hardness 7～7.5, density about 3g/cm3, shell-shaped fracture, ánh thủy tinh, transparent or opaque, pyroelectric. After being irradiated with gamma rays, tourmaline may have different discoloration due to different impurities.

The color of tourmaline is closely related to its value. Ví dụ, black or colorless tourmaline is useless in jewelry, while red, green or multi-colored tourmaline is the goal pursued by the jewelry industry. Nói chung, the price of beautiful and transparent tourmaline is slightly higher than that of aquamarine. Ví dụ, the price of transparent green tourmaline produced in China is about 10,000 yuan per kilogram. Các “color-changing tourmaline” with obvious discoloration characteristics is very rare and has become the object of collectors’ pursuit, and its value is very high without price.

Most tourmaline cat’s eyes (cat’s eye tourmaline) often have a large package body, which makes the flash wide and scattered, so the value is very low. The price of a small amount of package body is small, so cat’s eye is narrow and sharp, linh hoạt, and the price is 15-20 Đô la Mỹ mỗi carat, which is more than 10 times higher than that of high-quality tourmaline without cat’s eye effect.

 

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