Granite is one of the most abundant rocks on the earth's surface; it is a felsic intrusive igneous rock, made up mostly of feldspar, quartz and micas.
Marble is a metamorphic rock composed mainly of calcium carbonate (CaCO3). Marble is formed through a metamorphic process from sedimentary rocks, such as limestone or dolomite, which causes a complete recrystallization of the calcium carbonate of which they are mainly composed and gives rise to a mosaic of calcite or dolomite crystals (mineral) . The combined action of temperature and pressure, during the transformation of the sedimentary rock into marble, leads to the progressive obliteration of the structures and textures originally present in the rock, with the consequent destruction of any fossil, stratification or other sedimentary structure present in the original rock.
The name of onyx indicates two completely different types of rocks: siliceous onyx normally black in color streaked with white with SiO2 composition. n H2O, similar to chalcedony (but not quartz, which is crystalline), found in Brazil, Mexico, and other places; and the calcareous onyx, also called "alabastrite onyx", "etoca onyx" or "Egyptian onyx", which is composed of CaCO3 (the one from Montaione is brown or light green that of Pakistan).
Quartzite is a type of metamorphic rock composed mainly of quartz. It derives from the dismantling and subsequent metamorphic passage of quartzarenite.
Travertine is a light, yellowish rock. The small cavities present in the semi-compact structure are typical of travertine.