Very variable, depends on the constitution of the deposit used. Very often the slates used on the cover approach a gray or a blue-green when they are dry and a shiny black when wet.
Different models of cuts, often related to the inhabited region.
From rock called slate schist (sedimentary rock derived from clay, which has been subjected to strong tectonic pressures).
Composed of thin horizontal sheets. Excellent resistance to weather and climatic variations. Flammable. Raincoat.
Can be of different thicknesses and qualities and be more or less resistant.
Uses for the house:
Wall covering, floors and flat surfaces. As such it is used as tiles.
Aesthetic. Excellent behavior in time. No foam formation.
Slate deposits are not renewable (but are still present in large quantities). Slates that contain iron are prone to rust. Some slates are particularly friable.