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玛瑙是石英SiO_2的显晶质集合体,是玉髓的一种,即具有不同颜色而呈带状分布的玉髓。它是由含不同杂质的二氧化硅胶体溶液,分期沿岩石空隙的壁向内逐渐沉积而成的,半透明,颜色多样。 玛瑙通常诞生于火山活动的后期,岩浆喷出地表后大量水气逸散,岩石中有许多空洞。火山期后,饱含二氧化硅的胶体溶液一旦钻入这些空洞后,与四周岩石接触,散热快,造成从外至内逐层冷却的环境,便形成了似树木年轮状的环环相套的纹带构造。如纹带细而密、
Onyx is a crystalline silica SiO2 aggregates, is a kind of chalcedony, that is, with different colors and zonal distribution of chalcedony. It is composed of colloidal silica solution with different impurities, gradually deposited along the walls of the rock voids in stages, translucent and diverse in color. Agate is usually born in the late volcanic activity, after the magma spouts a lot of water and gas escape, there are many hollow holes in the rock. Volcanic period, the silica-rich colloidal solution once drilled into these holes, and the surrounding rock contact, heat quickly, resulting in cooling layer by layer from outside to inside the environment, they formed a tree-ring ring phase sets Texture of the band. If the ribbon is thin and dense,