1: Guanyin soil is also called kaolin, also known as expansive rock, bentonite, bentonite, clay and white mud.

It is a clay mineral with montmorillonite as the main component, and its chemical composition is quite stable, so it is called "universal stone".

2: In the old society, the poor often lived by eating Guanyin soil when the green and yellow crops were not available or during the famine years; This kind of soil can satisfy hunger, but it can't be digested and absorbed by human body. After eating it, it is bloating, difficult to defecate, and a small amount of it is not fatal. Although you won't be hungry, people will die because of lack of nutrition.

3: Guanyin clay is rich in minerals such as silicon, zinc, magnesium, aluminum, etc. Its chemical molecular abbreviation is Al4(Si4O1)OH6, and besides Al2O3, it also contains SiO2.

Guanyin clay is also called Kaolin.

China is the hometown of porcelain and kaolin. "Tian Gong Kai Wu Tao Bian" said: "The soil comes from Wuyuan and Qimen mountains: a Gaoliang mountain comes from japonica rice soil, which is hard; A civilized mountain, a glutinous rice soil. Its nature is soft. When the two soils are combined, porcelain will become. " The so-called glutinous rice soil refers to kaolin. Kaolin is an important raw material for the body and glaze of ceramic products and clay refractories. It is the first porcelain raw material discovered and applied by ancient porcelain workers in Jingdezhen, the porcelain capital of China, because it was first discovered in gao ling cun, 45 kilometers east of Jingdezhen, Jiangxi Province. Now it has become a common term for porcelain raw materials all over the world. That is to say, "kaolin" is the unified name of similar clay in the world, which is a great contribution of Chinese porcelain workers to the world.

the development and utilization of kaolin has laid a solid foundation for the rapid development of Jingdezhen porcelain industry, and played a significant role in the development of ceramic technology in the world. From the Yuan Dynasty to the mid-Qing Dynasty, the mining of Gaoling Mine was prosperous. Although Gaolingshan no longer produces kaolin, it has become a tourist attraction in Jingdezhen, the capital of porcelain, because of its position in the history of ceramics and a large number of ancient relics. It combines its cultural characteristics with natural scenery and becomes a ceramic monument with extremely rich natural and cultural landscapes. There are a mound of snow-white tailings, an ancient street in Dongfu Village, an ancient pier, a stone tablet in Ming Dynasty, a shop in Qing Dynasty in gao ling cun, an ancient mine, a Shuikou Pavilion, and inscriptions on the exploitation of kaolin from Wanli to Yongzheng in the Ming Dynasty. People are not only investigating the ancient excavation and elutriation of porcelain clay, but also enjoying the wonders of white tailings against the green hills and recalling the prosperity of making and transporting porcelain at that time.

the main characteristics of kaolin in chemical composition are high aluminum content and low flux content. Its origin is all over the country, with primary kaolin in the south and agglutinated kaolin in the north.

With the initial single-material porcelain (using porcelain stone as a raw material to make porcelain) and the later binary formula (using porcelain stone and kaolin as raw materials to make porcelain), the porcelain making technology in China is becoming more and more excellent. Using kaolin as raw material for porcelain making has greatly promoted the improvement of ceramic technology level and product quality, and promoted the development of ceramics.

The source of kaolin is quite fascinating. Legend has it that there was a poor but kind-hearted couple named Gao in gao ling cun. One winter, the north wind roared, dripping into ice, and an old man with white hair in shabby clothes fainted on the eaves of the Gaos. After the Gaos found out, they helped him into the house to warm him up and gave him porridge to drink ... When the old man left, he instructed the Gaos to go to the top of Gaoling Mountain, and kept digging 981 hoes, which would be a miracle ... The porcelain made is firm, white, bright and lovely.

Since Jingdezhen used kaolin to prepare porcelain, the porcelain produced is flawless and more exquisite. In 1712, French missionary Antrekelai introduced the porcelain clay of Gaoling to foreign countries, so kaolin became famous and worth a hundred times.