sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Mohs hardness of 6.5 to 7, earthy to vitreous luster, opaque, and conchoidal fracture.

Identified October 18, 2026More sedimentary →

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Physical properties

Mohs hardness of 6.5 to 7, earthy to vitreous luster, opaque, and conchoidal fracture.

Formed through the silification of sedimentary or volcanic deposits, often precipitated from silica-rich fluids.

Used primarily in ornamental carvings, cabochons, jewelry, and lapidary collecting.

Jasper has been used since antiquity for seals, talismans, and decorative art by ancient civilizations.

Identified by its dense, opaque coloration and lack of cleavage; 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)