sedimentary

Jasper

Silicon dioxide with impurities (SiO2)

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

Identified October 22, 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, yellow, and red, with a conchoidal fracture.

Formed from silica-rich fluids precipitating in sedimentary environments or volcanic ash beds, often during the Precambrian era.

Widely used for ornamental carvings, cabochons, jewelry, and polished display specimens.

Jasper has been used since ancient times for talismans, seals, and weaponry due to its toughness and ability to take a high polish.

Identified by its dense, opaque appearance and distinct color banding or patterning; 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

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)