sedimentary

Jasper

Silicon Dioxide (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, microcrystalline quartz structure, colors range from brown to red and yellow.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, microcrystalline quartz structure, colors range from brown to red and yellow.

Formed by the precipitation of silica from water in marine or hydrothermal environments, often during ancient sedimentary deposition.

Used primarily for 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 ability to take a high polish.

Identify by its waxy luster, conchoidal fracture, and opaque earthy tones; commonly found in riverbeds and mountainous regions 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)