sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, exhibits earthy or variegated colors with conchoidal fracture.

Identified October 22, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, exhibits earthy or variegated colors with conchoidal fracture.

Formed through the precipitation of silica-rich fluids in sedimentary or volcanic environments, often during ancient hydrothermal activity.

Commonly used in ornamental carvings, cabochons, jewelry, and as a popular specimen for rock collectors.

Jasper has been used since ancient times for talismans, seals, and weaponry due to its durability and rich colors.

Identified by its waxy luster, opacity, and distinctive multicolored banding; found worldwide 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)