Travertine is a terrestrial sedimentary rock formed by the rapid precipitation of calcium carbonate, often at the mouth of a hot spring or in a limestone cave. It is characterized by its distinct banded appearance and porous structure, making it a popular material in both geological collections and architectural finishings.

Hardness

3-4

Mohs

Luster

Dull to Earthy

Streak

White

Transparency

Opaque

sedimentarycommon

Travertine

Also: Lapis Tiburtinus, Calcareous Sinter

Hardness: 3-4
Luster: Dull to Earthy
Streak: White
Transparency: Opaque

Is this travertine?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch travertine with a known reference. Travertine sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Travertine leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Travertine typically shows a dull to earthy luster.
4
Match the color range
Compare against the expected color range: white, tan, cream, brown, yellow.
5
Look at form & habit
Typical habit: banded, crustiform, massive.

Often confused with

Travertine vs. its common look-alikes — and how to tell them apart in the field.

How to tell apart: Luster reads dull to earthy on Travertine and vitreous on Mexican Onyx.

How to tell apart: Luster reads dull to earthy on Travertine and vitreous on Calcite.

Compare →

Often found alongside travertine

Minerals reported to co-occur with travertine. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: CaCO₃
Mohs hardness: 3-4
Density: 2.5-2.7 g/cm³
Colors: White Tan Cream Brown Yellow
Streak: White
Luster: Dull to Earthy
Transparency: Opaque
Crystal habit: Banded, Crustiform, Massive
Cleavage: None
Rarity: Common
Uses: Decorative, Architectural, Collector
Host rock: Hot Springs and Limestone Caves
Typical price: $5-50 for small decorative specimens or slabs

Where rockhounds find travertine

4 mapped spots

Classic worldwide localities

Tivoli, Italy
Yellowstone National Park, USA
Pamukkale, Turkey
Hierapolis, Turkey

Field-hunting tip

Look in hot springs and limestone caves country — that is the host setting where travertine typically forms. If you start seeing calcite, aragonite in float, you are in the right ground. Field specimens usually show a banded, crustiform, massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in West Virginia, Wyoming — start trip planning there.

Browse 4 U.S. spots for travertine →

Common questions

How do you identify travertine?+

Mohs hardness is 3-4. It typically shows a dull to earthy luster. The streak is white. Common colors include white, tan, cream, brown.

Where is travertine found?+

Notable localities include Tivoli, Italy; Yellowstone National Park, USA; Pamukkale, Turkey; Hierapolis, Turkey.

Can I find travertine in the United States?+

RockHoundR maps 4 travertine rockhounding spots across 2 U.S. states — the top states are West Virginia, Wyoming.

How much is travertine worth?+

Typical asking prices fall in the range of $5-50 for small decorative specimens or slabs. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like travertine?+

Travertine is most often confused with Limestone, Mexican Onyx, Calcite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with travertine?+

Travertine commonly co-occurs with Calcite, Aragonite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does travertine form in?+

Travertine typically forms in hot springs and limestone caves. Working float back to the host body is the standard way to chase a fresh occurrence.

What is travertine used for?+

Travertine is used in decorative, architectural, collector.

Find travertine on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.