sedimentary

Travertine

Calcareous tufa (CaCO3)

Mohs hardness of 3, varies in color from white to tan and brown, vitreous to dull luster, and exhibits a banded or fibrous structure.

Identified November 12, 2026More sedimentary →

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Physical properties

Mohs hardness of 3, varies in color from white to tan and brown, vitreous to dull luster, and exhibits a banded or fibrous structure.

Formed by the precipitation of carbonate minerals from mineral waters, especially hot springs, typically in shallow caves or riverbeds.

Widely used in construction for flooring, wall tiles, and paving, as well as for decorative interior design and landscaping.

Travertine was heavily used in ancient Rome, most famously in the construction of the Colosseum.

Identified by its characteristic fibrous or concentric banding and visible pores; commonly found in Italy, Turkey, and the United States.

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

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)