Lapis lazuli has always been described as "a blue universe full of stars", and its gorgeous appearance is self-evident. The best quality lapis lazuli on the market is currently produced in Afghanistan, and other places of origin are the United States, Chile, Canada and Myanmar. So in the face of the complicated and complicated lapis lazuli market, how should we identify lapis lazuli when purchasing? Here's how to identify lapis lazuli.
Color is the color. The identification of lapis lazuli is the primary consideration of bright color. The color is too light. Because of the high content of calcite and the high content of calcite, the hardness is very low and it is easy to wear and break. The color is too deep, but the pyrite content is too high, which makes the lapis lazuli color dull, dull and unattractive. Therefore, in the identification of lapis lazuli, the lapis lazuli with bright blue, pure, uniform tone and luster is the best. In principle, the less symbiotic minerals in the lapis lazuli inclusion, the better, but the lapis lazuli that is completely pure without any symbiotic minerals is very rare and rarely seen on the market.
Quality is texture. The golden metal spot on the lapis lazuli is pyrite, while the white spots are mostly calcite. Therefore, the texture of lapis lazuli should be dense, fine and uniform in the distribution of metal spots and white spots. It should be noted when identifying lapis lazuli.
The beautiful lapis lazuli is mostly cut into round beads or egg noodles to make lapis lazuli jewelry. It is also carved into various carvings and ornaments, and some are sold as monolithic lapis lazuli ore. Generally speaking, under the same quality conditions, the larger the volume, the higher the value.
In addition to the identification of lapis lazuli in addition to color, texture, size, there are some specific identification methods.
1. There are a lot of lapis lazuli in the market with poor texture and color, and some merchants will use the dyeing method to deceive consumers. It can be wiped with a cotton swab dipped in acetone, and the dyed lapis lazuli will leave a blue mark on the cotton swab.
2. Since the synthetic lapis lazuli has a larger void fraction than natural lapis lazuli, the quality will increase after a period of time in the water.
3. The best lapis lazuli white spots are few, but rarely seen on the market. If you find lapis lazuli with a general price and very few white spots, you should pay special attention to the identification.
The structure of the sole is quite complex. In a broad sense, it can include all the materials that make up the bottom, such as the outsole, the midsole and the heel. In a narrow sense, it only refers to the outsole. Generally speaking, the common characteristics of sole materials should be wear-resistant, water-resistant, oil-resistant, heat-resistant, pressure resistant, impact resistant, elastic, easy to fit the foot type, not easy to change after setting, heat preservation, easy to absorb moisture, etc. at the same time, it should cooperate with the midsole, and have the brake function when walking to change the foot, not causing slipping and easy to stop, etc. There are many kinds of sole materials, which can be divided into natural and synthetic ones. Natural base materials include natural base leather, bamboo, wood, etc., while synthetic base materials include rubber, plastic, rubber plastic composite materials, recycled leather, elastic cardboard.
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