sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, various earth-tone colors including reddish-brown, with a cryptocrystalline structure.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, various earth-tone colors including reddish-brown, with a cryptocrystalline structure.

Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often dating back over hundreds of millions of years.

Used extensively for ornamental carvings, cabochons, polished decorative stones, and lapidary art.

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

Identified by its opaque nature and lack of cleavage, commonly found in riverbeds and mountainous regions globally.

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)