sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, various earth tones of red, brown, or yellow, with 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 earth tones of red, brown, or yellow, with a conchoidal fracture.

Formed from silica-rich fluids precipitating in sedimentary environments or volcanic cavities, often over millions of years.

Widely used for ornamental carvings, polished cabochons in jewelry, and decorative stone objects.

Jasper has been used since ancient times for seals, signet rings, and talismans by various civilizations including the Greeks and Egyptians.

Identified by its waxy luster, opaque nature, and hardness that scratches glass; commonly found in riverbeds and mountainous regions globally.

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