"Glowing" is not magic. Manganese-containing cleavage stone, rare earth-containing ore, barium-nickel ore, etc. Will shine. The "fluorite" luminous pearl will emit fluorescence or phosphorescence after absorbing external light. Accurately speaking, the night pearl is not a gem at all, and its value cannot be compared with single crystal diamond, ruby, sapphire and emerald. Experts pointed out that the word "night pearl" has never appeared in "gem" in the relevant appraisal of relevant state departments. The real luminous pearl should be natural, but with the development of science and technology, it is as easy to make an "artificial luminous pearl" as artificial marble, artificial diamond and artificial crystal. Adding some luminescent substances to ordinary ore will make it glow, "just like the previous clocks and watches glow at night." Experts say that the fake night pearl will emit fluorescence after being irradiated by strong radioactive sources, and some of them can last for three to five months or even a year. Experts stressed that many luminescent minerals contain radioactivity, and it is best not to approach or contact them for a long time without radioactive safety testing. Most luminescent materials are phosphors, and manufacturers with radiation are also afraid, so you don't have to worry. There are legends about the "Night Pearl" in China and all over the world. (2) According to historical records, the noctilucent stone was first discovered in ancient India. It is found that there are always many snakes lurking around a stone on a hill. Further observation shows that this stone can emit blue light at night, attracting many phototropic insects. Some frogs come to prey on insects, but they become a good meal for snakes. The snake that tasted the sweetness came here to "wait for the frog". At that time, Indians called this strange stone "Snake Eye Stone". (3) Many historical data show that the night pearl is not a pearl, but a round pearl made of several special minerals or rocks. 19 16 years, Japanese gemologist Suzuki min thought that Japan's luminous pearl was a kind of red crystal, which he called "red gem"; There is also a special kind of diamond, which can also become a night pearl. At present, the minerals that can emit light (that is, night phenomenon) in the world are fluorite, diamond, calcite, spodumene and so on. (4) the night pearl in historical records has never been seen in archaeology. In the past nine years, reports about the night pearl have been frequently reported in newspapers, and with the delay of time, the individual is getting bigger and bigger. In ancient times, the quality of the night pearl was calculated by "two" and "money", and the recently reported night pearl was as big as kilograms. For example, there was a 213.5g luminous pearl in the treasure house of Cixi in the Qing Dynasty, while the luminous pearls found in Nanjing and Guangzhou in May-July 2002 were 7kg,12.96kg and 20.5kg respectively. So far, the largest night pearl weighs 345 kilograms and has a diameter of 60 centimeters. It takes several people to lift it to move it. This huge night pearl was discovered in Nanyang, Henan Province in the spring of 2002. It is a large fluorite with a weight of 1.5 tons, which has been polished and processed for more than four months. ⑤ Fluorite is the main raw material of artificial "night pearl". Fluorite (CaF2 _ 2) is a kind of fluoride containing calcium. Because of its scarce elements, it often presents various attractive colors. Arsenic sulfide doped with fluorite can show strong fluorescence in the dark under the condition of illumination or heating. ⑥ Now, in addition to polishing the luminous pearl with fluorite, substances such as fluorite powder or phosphor powder are solidified into blocks according to a certain proportion under a certain humidity and pressure, and then cut and polished to make beaded luminous bodies. It can be seen that the night pearl is not mysterious. The "night pearl" in the window of jewelry store is the product of human wisdom. The night pearl is a wonderful pen for writers of all ages to write articles. Emperors of all ages believed that owning the luminous pearl was a symbol of power. Empress Dowager Cixi died with a pearl in her eye and will accompany her forever. For a long time, the night pearl, like a misty cloud, has built an eternal mystery for future generations to comment on. The most basic feature of the night pearl recorded in historical materials is that it emits bright light in the dark. So, what exactly is such a substance? According to analysis, there are minerals, rocks, mussels, snails, pearls and various creatures here. The mechanism of luminescence is the transformation of internal energy, such as the decay process of chemical elements, and the change of internal structure caused by the excitation of external energy.