Piperno is a

magmatic rock Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or ...

present in areas where there has been volcanic activity. Piperno abounds in

Campania Campania (, also , , , ) is an administrative Regions of Italy, region of Italy; most of it is in the south-western portion of the Italian peninsula (with the Tyrrhenian Sea to its west), but it also includes the small Phlegraean Islands and the i ...

; the areas from which it was obtained were the city of

Quarto Quarto (abbreviated Qto, 4to or 4º) is the format of a book or pamphlet produced from full sheets printed with eight pages of text, four to a side, then folded twice to produce four leaves. The leaves are then trimmed along the folds to produc ...

, Soccavo, Pianura and

Nocera Inferiore Nocera Inferiore ( nap, Nucèrä Inferiórë or simply , , locally ) is a town and ''comune'' in the province of Salerno, in Campania in southern Italy. It lies west of Nocera Superiore, at the foot of Monte Albino, some 20 km east-sou ...

. The Piperno layer, with the overlying Breccia Museo, is clearly visible at the base of the Camaldoli hill, in the Soccavo and Verdolino areas. This type of lithified rock, different from yellow

tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock cont ...

, takes on a particular texture characterised by the orientation of lenticular concentrations of grey colour, called flames, immersed in a matrix of the same colour but lighter. Piperno rock is not easy to extract, and is helped by underground separation of the large blocks that are subsequently worked; it is resistant to the wear and tear of atmospheric agents and for this reason it has been widely used for the cladding of buildings in

Naples Naples (; it, Napoli ; nap, Napule ), from grc, Νεάπολις, Neápolis, lit=new city. is the regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 909,048 within the city's adminis ...

. Currently it is no longer extracted as the underground quarries in Pianura and Soccavo are exhausted.

References

{{reflist Geology Volcanic rocks