sedimentary

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors due to mineral impurities, conchoidal fracture, and no cleavage.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors due to mineral impurities, conchoidal fracture, and no cleavage.

Formed through the silification of sedimentary formations or volcanic ash, typically in silica-rich aqueous environments over millions of years.

Widely used for ornamental carvings, cabochons, jewelry, and prized by mineral collectors.

Jasper has been utilized by ancient peoples for thousands of years to create tools, seals, and decorative ornaments.

Easily identified by its opaque nature, waxy luster, and colorful banding or patterns; 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