In physics, the luminous principle of the luminous pearl is that the stone with phosphorescence absorbs external energy after being exposed to sunlight, and then releases this energy in the dark, forming a silvery white brilliance.
The main materials of the night pearl are fluorite, calcite and some diamonds, among which fluorite is the most common.
Extended data:
Fluorite is also called fluorite, fluorite powder and fluorite powder. It is a mineral with equiaxed crystal system, and its main component is calcium fluoride (CaF2). There are many impurities, and Ca is often replaced by rare earth elements such as Y and Ce. In addition, it also contains a small amount of Fe2O3, SiO2 and trace amounts of Cl, O3 and He.
Fluorite in nature often shows bright colors, and some of it can emit fluorescence. Mohs hardness 4, lower than steel, easy to scratch, brittle, sweet, astringent and non-toxic. Melting point: 1270- 1350℃. Density: 3. 18g/cm? , refractive index: 1.434.
Formation principle
Fluorite comes from volcanic magma. In the process of magma cooling, the gas-water solution separated by magma contains many substances, mainly fluorine. In the process of solution rising along cracks, the temperature and pressure decrease, and fluorine ions in the gas-water solution combine with calcium ions in surrounding rocks to form calcium fluoride, and fluorite is obtained after cooling and crystallization.
It is an accessory mineral of granite, pegmatite and syenite, and fluorite can also be found in the blowholes around the volcano. It also occurs in carbonate rocks and alkaline intrusive rocks. Deposited in hydrothermal veins and stratabound deposits. Fluorite will act as a binder at the natural joints of sandstone.
Natural distribution
The main fluorite deposits are located in Cornwall, castleton, Derbyshire and Durham, England; Dom, France; Mont Blanc, Switzerland; German black forest; Spanish asturias; Dalinygorsk, Russia; Karaoba, Kazakhstan.
Hunan, China; Chihuahua, Abela, durango; New york, Ohio, Illinois, Tennessee, Colorado, New Mexico; Lake Ontario, British Columbia, Canada; Vanuco, Peru; Namibia; Pakistan.
References:
Baidu encyclopedia-fluorite