Porphyry: an ideal material for stairs
Porphyry is a particular type of volcanic rock belonging to the "Atesina Porphyry Platform", an
enormous complex of volcanic rocks that extends into the Trentino-Alto Adige region.
These rocks, extremely varied and differentiated, both as a chemical composition and as a form of
formation, are the result of an intense volcanic activity started 260 million years ago in the Permian
period, and continued for several million years with a continuous repetition of eruptive phases and
Among the various methods of deposition of these rocks, the so-called ignimbrites take on
particular importance, as these are the ones that gave rise to the "porphyry". These are flows of
liquid-gaseous mixtures with thicknesses generally ranging from 5 to 20 meters and with a fairly
constant chemism, up to the so-called ignimbritic unit, which reaches hundreds of meters thick.
Porphyry stairs and steps
The porphyry stairs can be glossy, semi-glossy or with the natural effect.
The porphyry steps are made from slabs of considerable size, "slabs of saw", having natural quarry
tops with variable thicknesses 3-4-5-6 cm.
The porphyry slabs are then sawed into the desired width, usually 30-33-35-40 cm and the long front
edge is evenly thickened. The long front edge can be flamed or split.
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