sedimentary
Travertine (Tufa)
Terrestrial Sedimentary Limestone (CaCO3)
Hardness: 3-4 (Mohs scale); Color: Tan, beige, or yellowish-brown; Luster: Dull to earthy; Structure: Highly porous (vesicular) with visible cavities; Cleavage: None (conchoidal to irregular fracture); Specific Gravity: 2.3-2.7
- Hardness
- 3-4 (Mohs scale)
- Color
- Tan, beige, or yellowish-brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Tan, beige, or yellowish-brown; Luster: Dull to earthy; Structure: Highly porous (vesicular) with visible cavities; Cleavage: None (conchoidal to irregular fracture); Specific Gravity: 2.3-2.7
Formation & geological history
Formed by the rapid precipitation of calcium carbonate from mineral springs, particularly hot springs. The porous nature often comes from the encrustation of plants (mosses/algae) or trapped gas bubbles. Ages range from Holocene to Paleozoic depending on the deposit location.
Uses & applications
Major use in construction as a building stone (cladding and flooring), decorative garden stones, and sculpture. In ancient times, it was used extensively in Roman architecture, including the Colosseum.
Geological facts
Travertine is technically a type of limestone but is distinguished by its terrestrial formation (on land) rather than marine. Hierapolis in Turkey (Pamukkale) is one of the world's most famous natural travertine terrace formations.
Field identification & locations
Identify in the field by its distinctive 'honeycomb' or porous texture and white-to-tan color. It will react and fizz when a drop of weak acid (like vinegar or HCl) is applied. Found near current or ancient geothermal areas and limestone caves.
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