sedimentary

Travertine

Calcium Carbonate (CaCO3)

Hardness of 3 on the Mohs scale, typically tan or cream-colored, with a dull to vitreous luster and distinct porous texture.

Identified November 15, 2026More sedimentary →

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Physical properties

Hardness of 3 on the Mohs scale, typically tan or cream-colored, with a dull to vitreous luster and distinct porous texture.

Formed by the precipitation of carbonate minerals from mineral-rich waters, especially around hot springs or caves.

Widely used in construction for flooring, tiles, and countertops, as well as exterior architectural cladding.

Travertine has been used as a building material since ancient Roman times, most notably in the construction of the Colosseum.

Identified by its characteristic pitted, porous surface and vigorous effervescence when tested with hydrochloric acid.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock