Travertine
The travertine is the white stone in between the bricks
(This is from the Colosseum
in Rome)
Travertine is a kind of sedimentary stone that is common in Italy. Like marble, travertine is a form of limestone. When limestone is put under a lot of pressure for a long time (thousands of years), it can turn into travertine, the way peat turns into coal. If the travertine is left under pressure for thousands more years, it can turn into marble, the way coal can turn into diamonds. So travertine is a kind of stone that is about halfway in between limestone and marble. It’s finer than limestone, but not as fine as marble.
The Romans used travertine on the main parts of buildings where it was too expensive to use marble. Often, for instance, the steps might be made of travertine while the columns or sculptures were made of marble. We do the same thing today.
Some examples of buildings in travertine are the Colosseum in Rome, or the baptistry at Pisa.
To find out more about travertine, check out this book from Amazon.com or from your library:
Houses, Villas, and Palaces in the Roman World, by Alexander McKay (reprinted 1998). A standard text on Roman houses.
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Tufa
Basalt
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