The chalcedony family of the micro-crystal quartz of the fire agate is only produced in the northern part of Mexico and in the southwestern part of the United States. It is a sub-precious stone with very low yield and hardness of 6.5 to 7 degrees as the average agate. According to the place of origin, this mineral was formed between 24 and 36 million years ago, when these areas were suffering from large-scale volcanic activity during the Tertiary period, and by this period of hot water, silica, iron oxide foam repeatedly Filling the cracks in the surrounding rock to form a layer of natural semi-precious stones, there is a thin layer of intercalation between the layers, the main component is silica with iron oxide, under the microscope, is a flaky mineral crystal.
The fire agate was first discovered by humans in Arizona around 1950 (some say it was between 1932 and 1934) and later found in the north of Mexico and California, USA. So far, the world has still No third country found a record of the fire agate.
In general, the color of the onyx layer is arranged as follows: the uppermost layer of the original stone usually shows orange, red or yellow, followed by green, then purple and blue, of course, the exception color arrangement abounds, and in rare cases, if When cut properly, she will present colorful and all the color sequences of the rainbow, see the picture below:
As for the types of fire agate fires: bubble fire, peacock, lizard skin (also known as gecko or dissolve) rainbow, tortoise shell, fireworks, starry sky, etc.
Because the early human understanding of the structure of the fire agate and the cutting tools are behind, the early fired agates are divided into four levels, emperors, gems, and commodities 1 and 2. The identification basis is as follows:
Emperor level: A fire of 95% or more is required. It is required to be able to see "fire" at any angle. There must be no dead ends. The color should be bright and bright. If it has a rainbow (colorful) light, especially the rare purple, blue and red, its value will be higher.
Gem grade: 90% or more of the fire is required. It is required to see "fire" at any angle, such as with rainbow (color) light, especially rare purple, blue and red, which will be of higher value.
Commodity level: A fire of 75 percent or more is required. If it comes with rainbow (colorful) light, especially the rare purple, blue and red, its value will be higher.
Commodity Level 2: Only 30 to 60 percent of the fire, 'fire' is dim, only the 'golden' fire or a little 'cyan' fire.
In recent years, people have a deeper understanding and understanding of the fire agate. On the international market, the fire agate of the 1st or 2nd grade of the commodity can no longer meet the requirements of the quality of the gemstone. The higher grade, the better quality of the agate gradually Became the new darling of the market. In recent years, the fire agate has been ranked among the top in the Western gemstone sales list, becoming one of the fastest growing gemstones.
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