Travertine Essay

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Travertine TRAVERTINE is a form of massive calcium carbonate, CaCO3 resulting from deposition by springs or rivers. It is often beautifully colored and banded as a result of the presence of iron compounds or other (e.g., organic) impurities. This material is variously known as calc-sinter and calcareous tufa and (when used for decorative purposes) as onyx marble, Mexican onyx, and Egyptian or Oriental alabaster. Travertine is generally less coarse-grained and takes a higher polish than stalactite and stalagmite, which are similar in chemical composition and origin. Travertine, the stone of the Colosseum and St. Peters as well as of several structures in New York and Philadelphia, is not a volcanic tufa but calcareous sediment that was deposited on the ground by the hot springs that first began to flow during the earliest eruptions of the Alban volcanoes. The best quality, in fact the only reliable one in Latium, is that which is found between Bagni and the Sabine hills below Tivoli. Lanciani, who has fascinatingly described the quarries there, estimated that five and a half million cubic meters of stone had been extracted from the ancient quarry alone. And yet, because of its position under a flat grass-grown plain, the Romans did not discover the existence of this remarkable stone till after the middle of the second century B. C.; and even after that they failed for a century to develop a system of extracting the stone in a sufficiently easy way to make the extensive use of it practicable. In the later decades of the second century B. C. it displaced peperino for inscriptional monuments for obvious reasons. Its employment in large structures cannot with certainty be posited before the construction of the Mulvian bridge in 109,...

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...lonade, as well as for the door posts and the horizontal arch over the door near the ground on the Forum side. The builder, therefore, chose it not only for parts that needed decoration but also for points of great strain, and that he knew its ability to stand wear is proved by his employment of it for the long staircase of 66 steps which lead up inside from the Forum to the Capitoline. Peperino and stone from Grotta Oscura are not found as integral parts of the masonry. Most of the vaults are of concrete. There seems to be only one piece of marble, and that is the threshold of the small door on the Forum side; a strange piece of luxury; it is Pentelic. References Frank, Tenney. Roman Buildings of the Republic: An Attempt to Date Them from Their Materials. American Academy in Rome: Rome. 1924. p. 34 Travertine http://www.antalya-ws.com/english/underwat/falez.asp#

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