sedimentary

Jasper

Microcrystalline quartz (SiO2)

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

Identified November 5, 2026More sedimentary →

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Physical properties

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

Formed from silica-rich fluids precipitating in sedimentary environments or volcanic fissures, often occurring in ancient marine deposits.

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

Jasper has been utilized since ancient times for talismans and seals, referenced across various classical civilizations for its protective qualities.

Identified by its opaque nature and lack of cleavage; commonly found worldwide in riverbeds, glacial drift, and mountainous deposits.

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)