What is slate? How is slate formed?
Jun 27, 2022
Slate can be used for roofs, floors or gardens. It is also a good decorative stone. There are various natural stones. What is slate? Many people don't know much about this kind of stone. How is slate formed? Don't worry, let's explain it to everyone below, let's take a look together.
What is slate?
Slate is a rock with a plate-like structure and basically no recrystallization.It is a metamorphic rock. The original rock is argillaceous, silty or neutral tuff, which can be peeled into thin slices along the direction of the plate. It is formed by slight metamorphism of clayey, silty sedimentary rock or medium-acid tuffaceous rock and sedimentary tuff.
Due to dehydration, the hardness of the original rock is enhanced, but the mineral composition is basically not recrystallized, with variable residual structure and variable residual structure, and the appearance is dense and cryptocrystalline. There are often a small amount of sericite and other minerals on the board surface, which makes the board surface slightly spun silky luster. Slate can generally be named according to the different color impurities, such as black carbonaceous slate, gray-green calcareous slate. In low-grade thermal contact metamorphism, shallow metamorphic rocks with speckled and plate-like structures can be formed, commonly referred to as "speckled rocks". Slate can be used as a building material and decorative material, and in ancient times, it was often used as tiles in areas rich in slate.
How is slate formed?
The formation of slate, like sandstone, is due to the movement of the earth's crust, and the sand and cement (silica, calcium carbonate, clay, iron oxide, calcium sulfate, etc.) are compressed and bonded by long-term huge pressure. sedimentary rock. At present, the main colors are light blue, black, light green, pink, tan, light gray, yellow and so on. Slate is not only rich in texture, but also hard in texture, quaint in color, low in water absorption, and free from radiation pollution.
The mineral composition is mainly mica, followed by chlorite, quartz, and a small amount of pyrite and calcite. The new slate contains more sand, more calcium and pyrite, and has hard lithology. The ore bodies are calcareous sericite slate and fine sericite slate, with a single layer thickness of 1-5cm.
The shallow metamorphic rocks are formed by the slight metamorphism of clayey, silty sedimentary rocks or medium-acid tuffaceous rocks and sedimentary tuffs. Black or grey-black. The lithology is dense and the plate cleavage is developed. There are often a small amount of sericite and other minerals on the board surface, which makes the board surface slightly spun silky luster. There is no obvious recrystallization phenomenon. Under the microscope, some mineral grains such as quartz, sericite and chlorite with uneven distribution can be seen, but most of them are cryptocrystalline clay minerals and carbonaceous and iron powders. With variadic structure and speckled structure.
The rock original rock with plate-like structure is mainly argillaceous rock, argillaceous siltstone and medium acid tuff. Slate is a low-grade product of regional metamorphism. Its temperature and isotropic pressure are not high, and it is mainly affected by stress. Metamorphic rocks with argillaceous and silty components as the main components, mainly argillaceous and silty components, and plate-like cleavage developed metamorphic rocks mainly composed of argillaceous and silty components. It can be used as building stone, stele, inkstone and other stone materials.
Over the years, natural stone has proven to be one of the most popular flooring materials. They have some potential properties that make them ideal for bathroom flooring. Slate, a natural stone, has inherent properties that make it an ideal bathroom flooring material.
