Is Peng Runtu and talc an ore?
Talc powder, English name PULVISTALCI, white or white like, fine, sand free powder, hand touch greasy. Odorless, tasteless. This product is insoluble in water, dilute ore, acid or dilute hydrogen alkali solution. It can be used medicinally. The main component of talc is talc, hydrated magnesium silicate, and the formula is Mg3[Si4O10] (OH) 2. Talc belongs to monoclinic system. The crystal is false, six sides or diamond flakes, occasionally. Usually dense clumps of leaves, rays, and fibrous aggregates. Colorless or white, but with a small amount of impurities and has light green, light yellow, light brown or pale red; the cleavage plane is Pearl luster. Hardness 1, specific gravity 2.7 ~ 2.8.
Bentonite is also called bentonite, bentonite and bentonite rock. The development and use of bentonite in China has a long history, but it was only used as a kind of detergent. (in Sichuan Renshou area, there was an open-air mine hundreds of years ago, and the local people called bentonite as earth powder). What is widely used but only a few hundred years of history. The earliest discovery in the United States was the yellowish green clay in Wyoming's ancient state, which expanded into a paste after adding water. Later, people referred to all these clays as "bentonite". In fact, the main mineral composition of montmorillonite is montmorillonite, the content is 85-90%, and some properties of bentonite are also determined by montmorillonite. Montmorillonite can be a variety of colors, such as yellow green, yellow white, gray, white and so on. Can be dense, massive, or for loose soil, with fingers rubbed when there is a sense of sliding, small pieces of water after the volume of swelling several times to 20-30 times, in the water as a suspended shape, less water when it was mushy. The properties of montmorillonite are related to its chemical composition and internal structure.
The bentonite is non metallic mineral montmorillonite as the main mineral composition, structure of montmorillonite is 2:1 type crystal structure of [1] consists of two silicon oxygen tetrahedron sandwiching a layer of aluminum eight surface body composition, due to the layered structure of montmorillonite crystal cell formation in the presence of some cations, such as Cu, Mg, Na, K, and the cation with montmorillonite crystal cell function is not stable, easy to by other cation exchange, so it has good ion exchange property. Foreign countries have already applied 24 fields and more than 100 departments in industry and agriculture. There are more than 300 products, so people call it "omnipotent soil"".
