sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic activity.

Used primarily for ornamental carvings, polished stones, cabochons, and decorative items in jewelry.

Jasper has been used since ancient times for seals, talismans, and decorative weapons due to its durability and rich colors.

Identified by its opacity and distinctive multicolored patterns; commonly found in riverbeds, mountainous regions, and ancient marine 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)