sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, and trigonal crystal structure.

Identified November 6, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, and trigonal crystal structure.

Formed from silica-rich solutions in sedimentary or volcanic environments, often through the alteration of deposits containing silica.

Used primarily for ornamental objects, cabochons, lapidary arts, and mineral specimen collecting.

Jasper has been used since ancient times for seals, signet rings, and various decorative items across many civilizations.

Identified by its opaque appearance, conchoidal fracture, and inability to be scratched by a steel knife.

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)