sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, reddish-brown color, vitreous to dull luster, and conchoidal fracture.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, reddish-brown color, vitreous to dull luster, and conchoidal fracture.

Formed through the precipitation of silica-rich fluids in sedimentary or volcanic environments over millions of years.

Used widely in ornamental carvings, cabochons, jewelry making, and as a collector mineral.

Jasper has been used since ancient times for amulets, seals, and tools, prized for its durability and rich earth tones.

Identified by its opaque appearance, waxy luster, and lack of cleavage; commonly found in riverbeds and mountainous regions.

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