sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors due to mineral impurities, and trigonal crystal system.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors due to mineral impurities, and trigonal crystal system.

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

Primarily used for ornamental carvings, polished cabochons, and gemstone jewelry.

Jasper has been utilized since ancient times for talismans, seals, and weaponry components across various civilizations.

Identified by its dense, opaque appearance and conchoidal fracture; commonly found in riverbeds and mountainous regions 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

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock