夜明珠,人们常视为无价之宝,是个珍贵稀罕之物。所谓夜明珠,顾名思意,就是能在夜间闪闪发光的珠玉宝石。具体的说,就是萤石中的佼佼者。萤石也叫氟石,成分为氟化钙(CaF_2)常呈无色、灰黄、绿、紫等色。结晶者为等轴品系之立方体、八面体或菱形十二面体等。宝石级的萤石,其色美丽鲜艳透明光泽强烈。但一般的萤石夜间不会发光,只有当晶莹剔透的萤石中含有微量的雄黄、雌黄等硫化物时,夜间才会闪闪发光、熠熠生 Night pearl, people often regarded as priceless treasure, is a precious rare thing. The so-called night pearl, as its name implies, is able to sparkle beads of gemstone at night. In particular, is the leader in fluorite. Fluorite also known as fluorite, calcium fluoride composition (CaF_2) often colorless, gray, green, purple and other colors. Crystallization of equiaxed lines of the cube, octahedron or diamond dodecahedron and so on. Gem-level fluorite, its beautiful bright color and strong transparent luster. However, the general fluorite will not be luminous at night, only when the crystal clear fluorite contains traces of realgar, yellow and other sulfides, the night will be glittering, shiny