sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, red to brown color due to iron inclusions, waxy luster, and conchoidal fracture.

Identified November 8, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, red to brown color due to iron inclusions, waxy luster, and conchoidal fracture.

Formed through the silification of sediment or volcanic ash, often in marine environments, over millions of years.

Used extensively for ornamental carvings, cabochons, jewelry, and as a polished collector specimen.

Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and fracture properties.

Easily identified by its opaque nature, vibrant color patterns, and inability to be scratched by steel.

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)