The difference between opal and glass


Opal bai is a natural hardened silica gel with 5-10% mo […]

Opal bai is a natural hardened silica gel with 5-10% moisture. Opal is different from most gems in that it is amorphous. Some of the unstable amorphous structure in opal will change color or even crack due to lack of moisture, but there are also some very stable opals that do not change in normal environments. Opal belongs to the class of opals in mineralogy. It includes two kinds of gemstones that change color and change color. It is a kind of water-containing amorphous silica.


Opal is a hydrate of silica, the composition is SiO2·nH2O, and it is an amorphous structure, so it has no certain shape, and the fracture is shell-shaped, mainly formed by the colloidal precipitation of silica. If it precipitates in biological remains, it will "Organic gemstones" are formed and deposited in the remains of sea snails to form "snail-shaped jade". Snail-shaped jade is rarely found in Hainan. The locals call it snail fossil or sea jade, which is extremely precious because of its scarcity.
Glass is formed by melting silicon dioxide and other chemical substances (the main raw materials for production are: soda ash, limestone, and quartzChina Opal opaque quartz factory). A continuous network structure is formed during melting, and the viscosity gradually increases during cooling and hardens to crystallize the non-metallic silicate material.

The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2 or Na2O·CaO·6SiO2, etc. The main component is silicate double salt, which is an amorphous solid with irregular structure. It is widely used in buildings to separate wind and transmit light. It is a mixture. There are also colored glass mixed with oxides or salts of certain metals to show color, and tempered glass made by physical or chemical methods. Sometimes some transparent plastics (such as polymethyl methacrylate) are also called plexiglass.