sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various red, brown, or yellow colors, and 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 red, brown, or yellow colors, and a conchoidal fracture.

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

Used extensively for ornamental carvings, cabochons, jewelry, and as a decorative stone in lapidary arts.

Jasper has been used since ancient times for seals, talismans, and decorative items, highly prized across various civilizations.

Easily identified by its opaque nature and rich earthy colors; commonly found in riverbeds, hydrothermal veins, and sedimentary deposits worldwide.

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)