sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including yellow, red, and brown, with a trigonal crystal system.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including yellow, red, and brown, with a trigonal crystal system.

Formed from silica-rich sediments or volcanic ash, precipitated in marine environments or hydrothermal veins over millions of years.

Used in ornamental carvings, cabochons, jewelry making, and as a decorative landscaping stone.

Jasper has been utilized since ancient times for talismans and seals, prized by early civilizations for its durability and rich earth tones.

Found worldwide in riverbeds and mountainous regions, identified by its waxy luster 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)