sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, red, and yellow, with conchoidal fracture.

Identified October 25, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, red, and yellow, with conchoidal fracture.

Formed from silica-rich fluids precipitating in sedimentary environments or volcanic fissures, often during the Precambrian to Cenozoic eras.

Commonly used for ornamental carvings, polished cabochons in jewelry, and decorative stone items.

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

Identify by its opaque nature, waxy luster, and inability to be scratched by a steel knife. Found globally in riverbeds and mountainous regions.

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)