sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Mohs hardness of 6.5 to 7. Displays earthy brown, red, or yellow colors with a vitreous to dull luster and conchoidal fracture.

Identified November 12, 2026More sedimentary →

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Physical properties

Mohs hardness of 6.5 to 7. Displays earthy brown, red, or yellow colors with a vitreous to dull luster and conchoidal fracture.

Formed through the silification of sedimentary or volcanic deposits, often precipitating from silica-rich fluids in marine environments.

Used extensively in ornamental carvings, cabochons for jewelry, and as decorative lapidary material.

Jasper has been utilized by humans since ancient times for tools, seals, and amulets, frequently mentioned in historical texts.

Identify by its opaque nature and dense waxy luster; commonly found globally in hydrothermal veins and sedimentary deposits.

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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)