Trachite has porphyritic structure, vitrofirica or holocrystalline often vacuolar or finely porous and therefore rough. It is light in color in the clear variety, dark in the vitreous. It is mainly composed of sanidine, plagioclase and biotite, which are associated subject pyroxene, amphibole, magnetite and apatite.
It is associated with orogenic environment not as a mid-ocean volcanic islands and is derived from alkaline basalts by fractional crystallization.
Trachite have spread are located in the Euganean Hills in Italy.
This stone is marketed as rock workable for building and urban products. It is present in many places in Italy: to quote Sardinia and, above all, the Euganean Hills area in the province of Padova. The term trachite, in the processing sector, however, is used loosely to mean generically stones extracted from effusive rocks with porphyritic structure or microcrystalline, such as ignimbrites and andesites.
Trachite was used in the past, and still is, primarily for road paving, sidewalks and borders of the same. In more recent times, thanks to its chromatic characteristics and the ability to be cut into thin slabs and polished, it is made also suitable for coating purposes and beautification of buildings, both for outdoor and indoor (stairs and floors).