by long-term pressure compression bonding and the formation of a Sedimentary rocks
non-slip, Naisuan Jian, fire cold, weathering, can fight good and so on.
and the texture of hard, color quaint, low water absorption, no radiation pollution, with matt
The current color is mainly light green, black, light green, pink, brown, light gray, yellow and so on. Slate is not only rich in board
Slate formation is the same as sandstone, due to the earth's crustal movement, sand and cement (silicon, calcium carbonate, clay, iron oxide, calcium sulfate, etc.)
