The snake's eye is a kind of fluorite. It contains many factors, so it has different colors and is very translucent. Ancient Indians found that there were a lot of cobras on the hills, and they were always wandering around a large rock. The strange natural phenomenon has caused people to explore the mystery. It turns out that whenever night falls, the big stones here will flash a slight blue light, and many phototaxis insects will fly over the bright stones. The frogs will jump out to compete for insects, and the cobras that are not far away will also come. Prey on frogs. Therefore, people call this stone "the snake eye." Later, I realized that the snake eye is fluorite. fluorite The composition of fluorite is calcium fluoride, also known as fluorspar, vermiculite, fluorite, etc., because of various rare elements, it is often purple, green, light blue, and the colorless and transparent fluorite is rare and precious. The crystal form has a cube, an octahedron or a rhombohedral dodecahedron. If you put the fluorite under a fluorescent light, it will emit beautiful fluorescence. Also known as scheelite and diamond under fluorescent light. The use of fluorite and its processed products has been involved in more than 30 industrial sectors. Adding fluorite to steelmaking can increase the fluidity of the melt and remove harmful impurities such as sulfur and phosphorus. Half of the world's fluorite production is used to make hydrofluoric acid, which in turn develops cryolite for use in the aluminum industry. The coolant (Freon) in the refrigerator should use fluorite; in 1986, the first generation of artificial blood in China should also use fluorite. In recent years, scientists are developing fluoride glass, which is likely to be a new type of optical fiber communication material that can pass through the 20,000-kilometer wide Pacific Ocean without a re-issuing station. The world's total fluorite reserves are about 1 billion tons, and China accounts for 35% of the world's reserves. According to archaeological excavations, the martial arts in Yuyao, Zhejiang, 7,000 years ago, have been used as decorations. There is indeed a fluorite mine in the south of Hemudu. Fluorine is not only found in fluorite, but also in certain groundwaters and hot springs. Chinese drinking water standards stipulate that fluoride should not exceed 1 mg per liter of drinking water. If the fluorine is excessive, it will cause fluorosis, and if the teeth are black, it will become "fluorine plaque", and the bone joint will be deformed or even lose labor. Endemic fluorosis spreads in more than 30 countries on five continents. China's fluorosis areas are distributed in 23 provinces and cities, and Shandong is more serious. Researchers have succeeded in reducing fluoride with natural zeolites and alumite systems.
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