sedimentary

Jasper

Microcrystalline quartz (SiO2)

Mohs hardness of 6.5 to 7, reddish-brown color due to iron oxides, dull to vitreous luster, and conchoidal fracture.

Identified November 6, 2026More sedimentary →

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Physical properties

Mohs hardness of 6.5 to 7, reddish-brown color due to iron oxides, dull to vitreous luster, and conchoidal fracture.

Formed through the silification of sedimentary or volcanic deposits, often in marine environments, over millions of years.

Used primarily in ornamental carvings, cabochons, jewelry, and as a popular lapidary specimen for collectors.

Jasper has been used since ancient times for talismans and weaponry and is often found in riverbeds and ancient seabed deposits.

Identify by its opaque nature, smooth waxy feel when polished, and characteristic earthy or bright red hues. Common worldwide.

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)