Slate Plate Structure, Enhanced Hardness

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. The color of slate varies with the impurities it contains.

Slate is a characteristic plate-like structure, and shallow metamorphic rocks are formed by slight metamorphism of clayey, silty sedimentary rocks or intermediate-acid tuff rocks and sedimentary tuff rocks.

The hardness of the original rock is enhanced due to dehydration, but the mineral composition is basically not recrystallized, and has a variable structure and a variable structure. The appearance is dense and hidden crystals, and the mineral particles are very fine, which is difficult to distinguish with naked eyes. There are often a small amount of sericite and other minerals on the surface of the board, which makes the surface of the board slightly silky. Slate can generally be named according to 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, often called "spotted rocks". Slate can be used as building materials and decorative materials, and was often used as tiles in areas rich in slate in ancient times.