sedimentary
Travertine
Calcareous Tufa / Travertine (CaCO3)
Hardness: 3-4 (Mohs); Color: Tan, beige, brown, and cream; Luster: Dull to pearly; Crystal Structure: Trigonal/Rhombohedral (Calcite/Aragonite); Porous and banded texture.
- Hardness
- 3-4 (Mohs)
- Color
- Tan, beige, brown, and cream
- Luster
- Dull to pearly
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Physical properties
Hardness: 3-4 (Mohs); Color: Tan, beige, brown, and cream; Luster: Dull to pearly; Crystal Structure: Trigonal/Rhombohedral (Calcite/Aragonite); Porous and banded texture.
Formation & geological history
Formed through the rapid precipitation of calcium carbonate, often at the mouth of a hot spring or in a limestone cave. It is chemical sedimentary rock formed via evaporation.
Uses & applications
Used widely in construction for facades, wall cladding, and flooring. Highly valued as a decorative stone in architecture and interior design.
Geological facts
Many of the structures in ancient Rome, including the Colosseum, are built primarily of travertine. Its unique banded appearance is due to the presence of organisms like algae and changes in water temperature.
Field identification & locations
Identify by its distinct wavy banding and small pits or holes (pores) where gas bubbles or organic material were trapped during formation. It will react and fizz if exposed to dilute hydrochloric acid.
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