Travertine
Calcium carbonate (CaCO3, calcite/aragonite)
A banded, porous limestone deposited by mineral springs, prized as a warm-toned natural building and tile stone.
- Mohs hardness
- 3-4
- Color
- Cream, tan, ivory, beige, to reddish-brown
- Type
- sedimentary
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Overview
Travertine is a form of limestone (calcium carbonate) deposited from mineral-rich spring waters, especially hot springs. It is characterized by concentric banding, a fibrous or layered texture, and distinctive pits and holes left where gas bubbles and plant material were trapped during deposition.
Its warm cream, tan, and reddish tones come from iron and other trace impurities. Travertine is denser and harder than tufa (a related, more porous spring deposit) but softer than fully crystallized marble.
It has been a treasured building stone for millennia — Rome's Colosseum is built largely of travertine quarried at Tivoli, the source of the rock's name.
Formation & geology
Travertine forms where groundwater charged with dissolved calcium carbonate emerges at springs, especially hot or carbonated springs. As the water reaches the surface, pressure drops and carbon dioxide escapes, causing calcite (or aragonite) to precipitate rapidly.
The carbonate builds up around the spring vent in layered terraces, mounds, and crusts. Trapped gas bubbles and decaying vegetation create the characteristic holes and porous bands.
Famous active examples include Mammoth Hot Springs in Yellowstone and the terraces of Pamukkale in Turkey. Ancient travertine quarries near Tivoli, Italy supplied stone for much of imperial Rome.
How to identify it
Look for a banded, cream-to-tan stone full of small holes and pits, often with a fibrous or layered appearance along the bands.
As a carbonate it fizzes in dilute acid. It is soft (Mohs ~3-4) and can be scratched by a steel knife. Polished tiles often have the holes filled with resin or cement.
Look-alikes: Tufa is more porous and crumbly; limestone is denser and less banded; onyx marble ("Mexican onyx") is a more translucent, tightly banded relative. Marble is harder, crystalline, and lacks the open pores.
Uses & significance
Travertine is a premier architectural and decorative stone, used for flooring, wall cladding, countertops, tiles, pool decks, and facades. Its earthy tones and natural texture make it a popular alternative to marble and granite.
Historically it built monuments from the Roman Colosseum to St. Peter's Square colonnade. Crushed travertine is also used in agriculture and as a soil conditioner.
It is too soft for fine jewelry but is carved into ornaments, tiles, and tumbled stones. Some attribute calming, grounding metaphysical qualities to it, though these are not scientifically supported.
Frequently asked questions
Is travertine a marble or a limestone?
Travertine is a type of limestone deposited by mineral springs. It is not a true marble, though it is sometimes loosely called one in the stone trade.
Why does travertine have holes in it?
The holes form where gas bubbles and plant matter were trapped as carbonate precipitated from spring water. In tiles these pits are often filled with resin.
Is travertine durable for flooring?
Yes, when sealed. It is softer than granite and reacts to acids, so it needs sealing and gentle, acid-free cleaners to resist etching and staining.
How can I tell travertine from marble?
Travertine is softer, banded, and porous with visible holes, while marble is harder, crystalline, and has a smooth, often veined surface.
Travertine guides
In-depth guides for identifying, valuing, and understanding Travertine.
Travertine identified by the community
Real specimens identified with Rock Identifier.
