sedimentary

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Hardness of 6.5-7 on the Mohs scale, waxy to dull luster, and opaque green to brown color with iron oxide staining.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, waxy to dull luster, and opaque green to brown color with iron oxide staining.

Formed through the accumulation of silica-rich sediments or silica-replaced organic material, often in marine environments.

Used primarily for ornamental carvings, cabochons, jewelry, and lapidary art.

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

Identify by its dense, smooth fracture and opaque earthy tones. 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

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