sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors due to impurities, and a conchoidal fracture.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors due to impurities, and a conchoidal fracture.

Formed from silica-rich solutions precipitating in sedimentary environments or volcanic ash beds over millions of years.

Used primarily in ornamental carvings, cabochons, jewelry, and as a popular lapidary material.

Jasper has been used since ancient times for seals, talismans, and decorative weaponry.

Identify by its waxy luster, opacity, and smooth texture. Common worldwide in riverbeds and ancient seabed 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

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock