What is the color of the slate? Soft and hard Structure?
With a residual muddy structure. Slate is a low-level product of regional metamorphism, temperature and pressure are not high, mainly by the impact of stress.
Recrystallization is not obvious, microscopic visible mud and some sericite, chlorite, silicic acid, sometimes see a small amount of muscovite, biotite, quartz and so on
Slabs are made of slate rock. The main rock is mainly mudstone, muddy siltstone and middle acid tuff.
