sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, red to brown color, dull to greasy luster, cryptocrystalline structure, conchoidal fracture.

Identified October 30, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, red to brown color, dull to greasy luster, cryptocrystalline structure, conchoidal fracture.

Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with ancient marine deposits.

Used primarily for ornamental carvings, polished cabochons in jewelry, and as a decorative stone for collectors.

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

Identify by its opaque red-brown coloration, waxy luster, and lack of cleavage. Found worldwide in sedimentary and volcanic rock cavities.

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)