sedimentary

Jasper

Microcrystalline quartz (SiO2)

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

Identified October 18, 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, brown, and yellow, with a conchoidal fracture.

Formed through the silification of sedimentary deposits or volcanic ash, often precipitating from silica-rich fluids in ancient marine environments.

Used primarily in lapidary work, ornamental carvings, cabochons, and as a collector specimen.

Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and ability to take a high polish.

Identify by its waxy luster, opaque nature, and lack of visible crystal structure. Found globally in ancient 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

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)