✔ 最佳答案
Clay: smooth, soft, white, used to make statues.
Chalk: A stone which is easy to snap, can be made into other colours, powders come off when rubbed, used to write on blackboard
Marble: A strong, smooth type stone, used to put in fish tank.
Sand: Very small and feel like salt
Slate: rough stone and strong.
Granite: rough before manufactured, has mixture colours, used to make tables after it is smoothed.
sandstone: A stone which looks as if it got a cover of sand over it, used to make sandpaper, rough.