sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque with a waxy luster, and exhibits a microcrystalline structure in various red, brown, or yellow hues.

Identified November 15, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque with a waxy luster, and exhibits a microcrystalline structure in various red, brown, or yellow hues.

Formed by the precipitation of silica-rich fluids in sedimentary basins or volcanic environments over millions of years.

Commonly used for ornamental carvings, cabochons, jewelry, and as a collector's mineral specimen.

Jasper has been utilized since ancient times for talismans, seals, and weaponry due to its durability and smooth fracture.

Identify by its opaque nature, conchoidal fracture, and lack of reactivity to acid; found globally in alluvial deposits and riverbeds.

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