The Luserna Stone produced at our firm has historically been one of the most typical among building stones used in Piedmont. This lithotype belongs to the family of metamorphic rock. It is an orthogneiss deriving from the deep metamorphism of either granite, clay and sand sediments, or pre-existing magmatic rocks. The quarries are located within the municipality of Luserna San Giovanni (Torino), in the so called Seccarezze area. Quarry lots number 2, 3 and 4 sit on city property, rented out by Maccagno Rag. Vincenzo S.r.l. From a petrographic point of view Luserna Stone is a gneiss containing characteristic elliptic or lenticular shear bound feldspar porphyroclasts. The polycrats’ millimetric size gives the gneiss a glandular disposition. The gneiss is composed of feldspars (30-50%), quartz (30-40%) and greenish micas (10-20%), giving it its characteristic light grey colour tending to greenish. The rock has a flat schistous structure, with schistocity varying from an area to another. The stone extracted from our quarries is particularly characterized by the lowest pencil cleavage of the entire quarryfield. This feature has traditionally made our material very compact and fit for sawing and the subsequent surface processings, such as flaming, brushing, smoothing, polishing and bush-hammering. Although all stone quarried the Luserna San Giovanni area shares the same morphology, the low pencil cleavage of our stone is truly unique. This property makes our stone particularly fit for large size and high thickness products, such as flagging and road pavements. It would be very hard to obtain similar products from the neighbouring quarries, characterized by a completely different and incomparable weaving, disposition and pencil cleavage degree.