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 a conchoidal fracture.

Identified November 12, 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 a conchoidal fracture.

Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often dating back billions of years.

Used widely in ornamental carvings, jewelry, cabochons, and as a decorative lapidary material.

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

Identified 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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)