sedimentary

Travertine / Tufa

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale. Color: Cream, tan, reddish-brown, light pink. Luster: Dull, earthy, or resinous. Structure: Porous, fibrous, or concentric microcrystalline aggregate.

Hardness: 3 on Mohs scale
Color: Cream, tan, reddish-brown, light pink
Luster: Dull, earthy, or resinous

Identified July 23, 2026More sedimentary →

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Physical properties

Hardness: 3 on Mohs scale. Color: Cream, tan, reddish-brown, light pink. Luster: Dull, earthy, or resinous. Structure: Porous, fibrous, or concentric microcrystalline aggregate.

Formation & geological history

Formed by the precipitation of calcium carbonate around hot springs, in limestone caves (stalactites/stalagmites), or along river beds rich in dissolved calcium.

Uses & applications

Used widely as a decorative building stone, floor tiling, landscaping rock, and for ornamental carvings.

Geological facts

Travertine is famous for its use in ancient Roman architecture, including the exterior of the Colosseum in Rome.

Field identification & locations

Identified by its lightweight, porous texture, earthy color palette, and strong reaction (fizzing) when exposed to dilute hydrochloric acid. Commonly found near geothermal springs and karst regions.