What is agate?

Everyone has heard of agate. A large number of people think that agate is not a stone? Today, Xiaobian will give you a general knowledge of agate from various aspects. Let's learn together.

Introduction to agate

Agate is a kind of chalcedony mineral, often a strip-like block mixed with opal and cryptocrystalline quartz. The hardness is 7-7.5 degrees, the specific gravity is 2.65, and the color is quite layered. It is translucent or opaque. Commonly used as accessories or play. A string of agate balls is often seen in ancient funerary objects.

classification

Agate can be divided into chalcedony and agate. The original stone color is not complicated, called "chalcedony", and the original stone with straight parallel stripes is called "streaked agate" (sliced ​​agate). According to the color of the original stone, there are sardine agate, crimson agate, red agate, grassy pattern and different degrees of green for the water agate, red and often accompanied by red and black red onyx, etc. Wait.

form

The history of agate is very far away. About 100 million years ago, underground magma spewed out a lot due to changes in the earth's crust. When the lava cooled, steam and other gases formed bubbles. The bubbles are sealed when the rock freezes to form a number of holes. A long time later, the hole was immersed in a solution containing silica to condense into a silica gel. The fusible component of the iron-containing rock enters the silica gel, and finally the silica crystallizes into agate. In mineralogy, it belongs to the chalcedony, which is a stone pulp with different colors and a band-like distribution. Usually, the colloid of silica is gradually filled toward the center along the peripheral wall of the cavity or void of the rock to form a concentric layered or parallel layered block. It is generally translucent to opaque, with a hardness of 6.5 to 7 degrees, a specific gravity of 2.55 to 2.91, and a refractive index of 1.535 to 1.539. Agate can be formed in both igneous and sedimentary rocks in various geological history. Therefore, there are a lot of agates and the difference in color is also great. According to the pattern and color, there are names such as agate, moss agate and jasper agate.

use

Agate is used as a gemstone or as a craft product because of its rich color and beauty. It can also be used to make bearings for precision instruments, industrial products such as agate carcasses and agate mortars.

Place of origin

The famous agates in the world are: China, India, Brazil, the United States, Egypt, Australia, Mexico and other countries. Mexico, the United States and Namibia also produce agate with lace-like stripes called "lace agate." Yellowstone, Wyoming, and Montana also produce "scenery agate." China's agate production area is also widely distributed, almost all provinces, famous places are: Yunnan, Heilongjiang, Liaoning, Hebei, Xinjiang, Ningxia, Inner Mongolia and so on.

chemical composition

Silica SiO2 is mainly used.

The above introduces the introduction, classification, formation, use, origin and chemical composition of agate. For those who don't know agate a lot, do you have a new definition of agate through these introductions?

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