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The forming conditions of crystals are more exacting than that of ordinary quartz. First, sufficient and stable growth space is needed. Secondly, there should be a rich siliceous mineral hydrothermal fluid, slightly alkaline, low salinity; Third, a high temperature (160 0c-400 0C) and a high...

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The forming conditions of crystals are more exacting than that of ordinary quartz. First, sufficient and stable growth space is needed. Secondly, there should be a rich siliceous mineral hydrothermal fluid, slightly alkaline, low salinity; Third, a high temperature (160 0c-400 0C) and a high pressure (2-3 atmospheres) are required. Fourth, there is a certain growth time, with these four conditions to produce crystal. In nature, the developed joints and faults are good Spaces for crystal growth. Granite is strongly developed or metamorphic and can provide sufficient hydrothermal fluid, which has good temperature and pressure. Time factors are more readily available, so crystal production on earth is more extensive.


Crystals are often produced in the form of clusters and caves, in which crystal caves are generally found in the igneous rocks and basalts of the thick lava flow layers formed by volcanic eruptions. A large number of pores occur in the rocks due to the gas or hot water dissolution contained in volcanic eruptions. When silica-rich fluids enter the pores of the thinner lava, crystals will be precipitated out of crystals and other minerals when the temperature and pressure conditions are appropriate.


This type of Crystal is very large, so it is difficult to be classified as phanerocrystalline or cryptocrystalline. Therefore, it is classified as a Special type.


Cryptocrystalline crystals are monolithic, not hexagonal, but they are also hexagonal. But their hexagonal crystals cannot be seen with the naked eye because they are so small that they can only be seen with the aid of a microscope. This type of crystal is very smooth because the crystals are filled with "hydrated silica," and agate is one of them.


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