Slate (also called stone of Lavagna) is a metamorphic rock of sedimentary origin.
It is a variety of limestone and shale split easily into thin sheets, flat, lightweight, waterproof and weather-resistant, resulting from low-grade metamorphism of sedimentary rocks formed by deposition of a fine silt (marl) due to erosion of ancient reliefs. Slate is a rock classified as soft or semi-hard.
It is a compact stone, leaden-blackish color and easy to work. The slate tends to clear from their extraction up to take a light gray pigmentation, the darker shade being due to carbon residues which oxidize when in contact with oxygen, moisture and ultraviolet radiation. By virtue of its schistosity (ie the ability to divide into slabs according to the cleavage planes due to its foliation) and properties, can be employed in various craft and industrial segments both architecture and construction (for the construction of roofs, floors, steps of stairs) and in art in the design and shelf everyday.
The use of slate – for which there has been recently rediscovered in the use architecture for the restoration of historic buildings, for furniture, for the construction of billiards, for the beautification of interior – is still before at the time of Roman rule. In fact, in Chiavari, from Blackboard, a necropolis consists of graves to “box” made entirely of this material (VIII – VII century BC) was found.
In the valley Fontanabuona the first deposits to be exploited intensively in the twelfth century were those of Uscio and Recco, although the mid-nineteenth century the major mining centers are located on Mount Verzi (Lorsica), on high ground and in Orero municipality of Moconesi.
roofs, flooring, wall coverings, kitchen countertops and bathroom
polished, brushed, sanded, bush-hammered, waterjet and brushed, flamed