sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors including red and brown, and conchoidal fracture.

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 including red and brown, and conchoidal fracture.

Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids precipitate quartz in cavities or fractures.

Used widely in ornamental carvings, cabochons, jewelry, and as a decorative stone.

Jasper has been used since ancient times for talismans, seals, and weaponry components by various civilizations worldwide.

Identify by its waxy luster, opacity, and hardness that scratches glass; 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