... and outside paving,wall decorations etc,3-Available Color: Yellow, Rusty, Black, Grey, Green, Mixed color and so on4-Size:100x100mm,100x200mm,100x300mm ... tool in the quarry, many slates will form smooth flat sheets of stone which have long been used for roofing and ... floor tiles and other purposes. Slate is frequently grey in color, especially when seen in masse covering roofs. However, slate occurs ...