sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Identified October 25, 2026More sedimentary →

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Physical properties

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

Formed through the silification of sedimentary deposits or volcanic ash, occurring globally in ancient marine and lacustrine environments.

Widely used in ornamental carvings, cabochons, jewelry, and as a decorative lapidary stone.

Jasper has been utilized since ancient times for talismans, seals, and weaponry components across various civilizations.

Identify in the field by its smooth, water-worn texture, opaque earthy colors, and inability to be scratched by a steel knife.

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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)