sedimentary

Travertine

Travertine (CaCO3 - Calcium Carbonate)

AI-generated identification · may be incorrect

Hardness: 3-4 (Mohs scale); Color: White, tan, cream, or beige; Luster: Dull to pearly; Crystal structure: Trigonal (as calcite/aragonite); Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Hardness: 3-4 (Mohs scale)
Color: White, tan, cream, or beige
Luster: Dull to pearly

Identified March 17, 2026More sedimentary →

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Physical properties

Hardness: 3-4 (Mohs scale); Color: White, tan, cream, or beige; Luster: Dull to pearly; Crystal structure: Trigonal (as calcite/aragonite); Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed by the rapid precipitation of calcium carbonate, often at the mouth of hot springs or in limestone caves. It is a terrestrial sedimentary rock, often varying in age from Quaternary to ancient geologic periods depending on the deposit site.

Uses & applications

Extensively used in construction for flooring, wall cladding, and counter-tops. Historically used for monuments and buildings like the Roman Colosseum. Also popular in landscaping and decorative masonry.

Geological facts

Travertine is characterized by its pitted surface and small holes, which are caused by trapped gas bubbles during the rapid precipitation process. The Getty Center in Los Angeles is composed of 1.2 million square feet of travertine imported from Italy.

Field identification & locations

Identify in the field by its porous, vesicular texture and its strong effervescent reaction to dilute hydrochloric acid. Commonly found in Italy (Tivoli), Turkey, Mexico, and the United States (Yellowstone National Park).