... .slate made,durable to use 2.natural color,no rust and fade 3.split by hand 3. ... 1.material of mushroom slate:• usual is natural slate and quartz also is available.2.size of ... slate:• popular is 400x100mm,200x100mm,300x150mm,longer and smaller size all available3.color of mushroom slate ... yellow, green, rusty colors For example: material:natural slate size:400x200x15-30mm color:greem,yellow, grey, ...