sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Identified November 11, 2026More sedimentary →

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Physical properties

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

Formed from the precipitation of silica-rich fluids in sedimentary basins or volcanic environments over millions of years.

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

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

Identified easily by its opaque nature, high hardness, and smooth waxy luster, 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

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)