From the mineralogy point of view, agate is a cryptocrystalline quartz crystal transformed from colloid, while chalcedony does not undergo a colloidal phase, directly producing cryptocrystalline crystals; in terms of appearance characteristics, agate often has different colors of crepe The ring belt (so called agate is a banded chalcedony), while the chalcedony is not.
Despite this, the two are still often confused in the market. So the use of chalcedony and agate is the same. It can also be burnt red or dyed. In terms of genesis, chalcedony has two kinds of low temperature hydrothermal fluid and superficial growth. The former is found in the hollows, hot liquid veins or hot spring sediments of the erupted rock; the surface is seen in the weathering crust and the oxidized zone.
Its origin is almost all over the world, and Brazil, the United States, Russia, Australia, India and other places are particularly famous. China is mainly produced in Gansu, Ningxia, Xinjiang, Inner Mongolia and other places.
In addition, the more uniform and fine the structure of the chalcedony, the denser the combination, the higher the quality. In general, the cracks that appear in the chalcedony and the less impurities they contain are less pronounced and the higher the value.
It is understood that chalcedony also has a good regulating effect on spirit and psychology. Therefore, if you want to buy chalcedony, you must classify and understand, you must not generalize.
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