sedimentary

Jasper

Microcrystalline quartz (SiO2)

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

Formed from silica-rich fluids precipitating in sedimentary environments or volcanic fissures, often occurring in Precambrian formations.

Widely utilized in ornamental carvings, cabochons, jewelry making, and lapidary collections.

Jasper has been used since ancient times for talismans, seals, and decorative weaponry due to its durability and rich color patterns.

Easily identified by its opaque nature and lack of cleavage; commonly found worldwide in riverbeds, hydrothermal veins, and sedimentary 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

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)