Slate is made of what kind of rock
There is no obvious recrystallization phenomenon. Under the microscope can be seen in some uneven distribution of quartz, sericite, chlorite and other mineral grains, but most of the aphanitic clay minerals and carbon, iron powder
Black or grayish black. Lithology dense, plate cleavage development. In the board often a small amount of sericite and other minerals, so that the surface of micro-silk silk gloss
A metamorphic rock. From the clay, silty sedimentary rocks or acid tuffy rocks, tuffs formed by a slight metamorphism
