sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Identified November 13, 2026More sedimentary →

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Physical properties

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

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

Used primarily in lapidary work, decorative carvings, cabochons, and gemstone jewelry.

Jasper has been utilized since ancient times for seals, talismans, and decorative ornaments by various civilizations.

Identified by its waxy luster, opacity, and hardness that scratches glass; commonly found in riverbeds and silicate-rich deposits 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