sedimentary

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

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

Identified November 8, 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 conchoidal fracture.

Formed from silica-rich precipitates in marine or hydrothermal environments, often over hundreds of millions of years.

Used primarily for ornamental carvings, polished cabochons in jewelry, and geological specimen collecting.

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

Identify by its waxy luster, opacity, and hardness that scratches glass; 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

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)