sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, waxy to dull luster, and conchoidal fracture.

Identified November 1, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, waxy to dull luster, and conchoidal fracture.

Formed through the precipitation of silica-rich fluids in sedimentary basins or volcanic environments, often during hydrothermal activity.

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

Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness.

Identified by its opaque red-brown appearance and lack of cleavage; commonly found in arid regions and riverbeds 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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)