sedimentary

Jasper

Cryptocrystalline quartz, SiO2

Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, and comes in red, brown, yellow, or green colors.

Identified November 14, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, and comes in red, brown, yellow, or green colors.

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

Used extensively for ornamental carvings, polished cabochons, jewelry, and lapidary specimens.

Ancient civilizations prized jasper as a sacred talisman and utilized it extensively for seals and signet rings.

Identify by its opaque nature, conchoidal fracture, and inability to be scratched by steel. Found globally 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