major projects such as the Pantheon and Hadrian's Villa. Additionally, granodiorite was used for the Rosetta Stone. The extent of Egyptian granodiorite masonry is unclear. Egypt's 6000-year history makes determining the period of usage difficult as well. Perhaps like porphyry, it was ignored by the successive dynasties of Egypt and only heavily mined during Ptolemaic or Roman times. This is evidenced by the fact that most examples of granodiorite sculpture seem to have come from later dates. However, its presence in the Rosetta Stone implies that they had considerable experience with it and the fact that only newer artifacts are found may simply be because earlier pieces were lost. Ireland Granodiorite is quarried in the Newry area of County Armagh with the common name of 'Newry granite'. Uses Granodiorite is most often used as crushed stone for road building. It is also used as construction material, building facade, and paving, and as an ornamental stone. The Rosetta Stone is a stele made from granodiorite. The portico columns of the Pantheon in Rome are formed from single shafts of granodiorite, each 12 metres tall by 1.5 metres in diameter. See also List of rock types References . External links Felsic rocks Granitic rocks Intermediate rocks Plutonic rocks